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German Student Dictionary — Part 42
Dictionary entries, alphabetical: Kellner – Klebstoff.
Maskulin Feminin Neutrum Plural
der Kellner — waiter
Plural: die Kellner (unchanged, like "der Lehrer"). Feminine: die Kellnerin, plural die Kellnerinnen, bundled in the dictionary's entry.
Nom Der Kellner bringt uns die Speisekarte.
The waiter brings us the menu.
der Kellner (maskulin) = waiter · die Speisekarte, -n = menu. "Der" — maskulin Nominativ. Kellner is the subject.
Akk Ich rufe den Kellner.
I call the waiter.
rufen = to call. "Den" because maskulin Akkusativ (der → den). Kellner is the direct object.
Dat Wir haben dem Kellner ein Trinkgeld gegeben.
We gave a tip to the waiter.
das Trinkgeld, -er = tip · geben = to give. "Dem" because maskulin Dativ (der → dem). Kellner is the indirect object. The dictionary's own example, unchanged.
Nom Ein Kellner steht an der Theke.
A waiter is standing at the counter.
die Theke, -n = counter/bar. "Ein" — no ending before maskulin Nominativ, same as "der."
Akk Sie bittet einen Kellner um die Rechnung.
She asks a waiter for the bill.
bitten um + Akkusativ = to ask for · die Rechnung, -en = bill/check. "Einen" because maskulin Akkusativ indefinite (ein → einen) — mirrors der → den.
Dat Die Gäste danken den Kellnern für den guten Service.
The guests thank the waiters for the good service.
der Gast, ä-e = guest · danken + Dativ = to thank. Plural Dativ: the article is "den"; Kellner adds "-n" (Kellner → Kellnern) since the plural doesn't already end in -n or -s.
kennen — to be acquainted with; to know (people)
Irregular (mixed) verb: the present tense is fully regular (ich kenne, du kennst, er/sie/es kennt, wir kennen, ihr kennt, sie/Sie kennen), but the past tense changes the stem vowel — kannte, gekannt (not "kennte"). Contrast with "wissen" (to know facts): "kennen" is for people, places, and things one is personally familiar with.
Kennst du deine Nachbarn?
Are you acquainted with your neighbors?
der Nachbar, -n (weak noun) = neighbor. "Kennst" — du-form. The dictionary's own example, unchanged.
Ich kenne ihre Eltern nicht gut, denn ich habe sie eben erst kennengelernt.
I just met her parents, so I don't know them well.
die Eltern (Pl.) = parents · kennenlernen = to get to know/meet (a separable verb built from kennen + lernen) · eben erst = just now. The dictionary's own example, unchanged.
die Kerze — candle
Plural: die Kerzen.
Nom Die Kerze brennt die ganze Nacht.
The candle burns all night.
die Kerze (feminin) = candle · brennen = to burn · die ganze Nacht = all night. "Die" — feminin Nominativ. Kerze is the subject.
Akk Kannst du bitte die Kerze anzünden?
Can you light the candle, please?
anzünden = to light/ignite. Feminine nouns keep the same form in Nominativ and Akkusativ. Kerze is the direct object. Adapted from the dictionary's own example, which used the bare plural "Kerzen" — singularized here to drill the definite Akkusativ; OCR also garbled the umlaut in "anzünden," corrected here.
Dat Das Zimmer riecht nach der Kerze.
The room smells of the candle.
riechen nach + Dativ = to smell of. "Der" because feminin Dativ (die → der) after "nach."
Nom Eine Kerze steht auf dem Tisch.
A candle is standing on the table.
"Eine" — feminin Nominativ indefinite; no ending change from the "die" pattern.
Akk Sie zündet eine Kerze an.
She lights a candle.
Feminine nouns don't change between Nominativ and Akkusativ (eine → eine), unlike maskulin (ein → einen).
Dat Bei den brennenden Kerzen wird es im Zimmer warm.
With the burning candles, it gets warm in the room.
brennend = burning. Plural Dativ: article "den"; Kerze adds "-n" in the plural already (Kerzen), so Dativ adds nothing further.
kicken — to kick
Regular (weak) verb, a loanword from English — ich kicke, du kickst, er kickt. Common in football (soccer) contexts.
Er kickt den Fußball ins Tor.
He is kicking the football into the goal.
der Fußball, ä-e = football/soccer ball · das Tor, -e = goal. The dictionary's own example; OCR misprinted the ß in "Fußball" as a capital B, corrected here.
der Kilometer — kilometer
Plural: die Kilometer (unchanged, like "der Meter" or "der Computer"). Often appears as a bare measure word without any article, as in the dictionary's own example, "Wie viele Kilometer lang ist die Strecke zwischen New York und Chicago?" (How many kilometers are there between New York and Chicago?) — since that construction has no article to drill, the examples below reuse its New York–Chicago setting but add articles.
Nom Der erste Kilometer ist immer der schwerste.
The first kilometer is always the hardest.
der Kilometer (maskulin) = kilometer · schwer, schwerer, am schwersten = hard/difficult. "Der" — maskulin Nominativ. Kilometer is the subject.
Akk Sie läuft jeden Morgen den gleichen Kilometer.
She runs the same kilometer every morning.
laufen, er läuft = to run · gleich = same. "Den" because maskulin Akkusativ (der → den). Kilometer is the direct object.
Dat Die Strecke zwischen New York und Chicago beginnt mit dem ersten Kilometer.
The route between New York and Chicago starts with the first kilometer.
die Strecke, -n = route/distance · beginnen mit + Dativ = to begin with. "Dem" because maskulin Dativ (der → dem). Adapted from the dictionary's own example, which asked how many kilometers lie between New York and Chicago using the bare plural without an article — reworked here to drill the definite Dativ.
Nom Ein Kilometer entspricht ungefähr 0,6 Meilen.
A kilometer is about 0.6 miles.
entsprechen + Dativ = to correspond to · die Meile, -n = mile. "Ein" — no ending before maskulin Nominativ, same as "der."
Akk Wir laufen heute einen Kilometer mehr als gestern.
Today we're running one more kilometer than yesterday.
"Einen" because maskulin Akkusativ indefinite (ein → einen) — mirrors der → den.
Dat Auf den letzten Kilometern wird der Läufer immer langsamer.
On the final kilometers, the runner gets slower and slower.
der Läufer, - = runner · langsam = slow. Plural Dativ: article "den"; Kilometer adds "-n" (Kilometer → Kilometern) since the plural doesn't already end in -n or -s.
das Kind — child
Plural: die Kinder (an "-er" plural with no umlaut, unlike "das Buch → die Bücher"). Bundled in the dictionary's entry: der Kinderwagen (baby carriage), given its own entry next.
Nom Wie heißt das Kind?
What is the child's name?
das Kind (neutral) = child · heißen = to be called/named. "Das" — neutral Nominativ. Kind is the subject. The dictionary's own example; OCR misprinted the ß in "heißt" with a digit, corrected here.
Akk Die Mutter holt das Kind von der Schule ab.
The mother picks up the child from school.
abholen = to pick up. Neutral Akkusativ keeps the same form as Nominativ (das → das). Kind is the direct object.
Dat Der Lehrer hilft dem Kind bei den Hausaufgaben.
The teacher helps the child with homework.
helfen + Dativ = to help · die Hausaufgabe, -n = homework. "Dem" because neutral Dativ (das → dem).
Nom Ein Kind spielt im Garten.
A child is playing in the garden.
der Garten, ä- = garden. "Ein" — no ending before neutral Nominativ, same as "das."
Akk Sie erwarten ein Kind.
They are expecting a child.
erwarten = to expect. Neutral Akkusativ indefinite looks identical to Nominativ — the article never changes for neuter nouns between these two cases.
Dat Die Lehrerin liest den Kindern eine Geschichte vor.
The teacher reads a story to the children.
vorlesen = to read aloud · die Geschichte, -n = story. Plural Dativ: article "den"; Kind adds "-n" (Kinder → Kindern) since the plural doesn't already end in -n or -s.
der Kinderwagen — baby carriage
A compound of "das Kind" (child) + "der Wagen" (cart/carriage) — declines exactly like "der Wagen": plural die Kinderwagen (unchanged), Dativ plural die Kinderwagen (also unchanged, since "Wagen" already ends in -n). Bundled in the dictionary's entry alongside "Kind, das."
Nom Der Kinderwagen steht vor der Tür.
The baby carriage is standing in front of the door.
der Kinderwagen (maskulin) = baby carriage · die Tür, -en = door. "Der" — maskulin Nominativ. Kinderwagen is the subject.
Akk Sie schiebt den Kinderwagen durch den Park.
She pushes the baby carriage through the park.
schieben = to push · der Park, -s = park. "Den" because maskulin Akkusativ (der → den).
Dat Das Baby schläft in dem Kinderwagen.
The baby is sleeping in the baby carriage.
"Dem" because maskulin Dativ (der → dem) after "in."
Nom Ein neuer Kinderwagen kostet oft viel Geld.
A new baby carriage often costs a lot of money.
das Geld = money. "Ein" — no ending before maskulin Nominativ.
Akk Wir kaufen einen Kinderwagen für unser Baby.
We're buying a baby carriage for our baby.
"Einen" because maskulin Akkusativ indefinite (ein → einen).
Dat Zwischen den geparkten Kinderwagen ist wenig Platz.
There's little space between the parked baby carriages.
geparkt = parked · der Platz, ä-e = space/room. Plural Dativ: article "den"; Kinderwagen stays unchanged (Kinderwagen → Kinderwagen), the same as "der Wagen," since it already ends in -n.
der Kindergarten — kindergarten
Plural: die Kindergärten (umlaut only, no added suffix). A compound of "das Kind" (child) + "der Garten" (garden) — declines exactly like "der Garten."
Nom Der Kindergarten öffnet um acht Uhr.
The kindergarten opens at eight o'clock.
der Kindergarten (maskulin) = kindergarten · öffnen = to open. "Der" — maskulin Nominativ. Kindergarten is the subject.
Akk Meine kleine Schwester geht in den Kindergarten.
My little sister goes to kindergarten.
die Schwester, -n = sister. "Den" because maskulin Akkusativ (der → den) — "in den Kindergarten gehen" is motion into, so "in" takes Akkusativ. The dictionary's own example, unchanged.
Dat Die Kinder spielen in dem Kindergarten.
The children play in the kindergarten.
"Dem" because maskulin Dativ (der → dem) — here "in" describes location, not motion, so it takes Dativ.
Nom Ein neuer Kindergarten wurde letztes Jahr eröffnet.
A new kindergarten was opened last year.
eröffnen = to open (a business/institution). "Ein" — no ending before maskulin Nominativ.
Akk Sie besuchen einen Kindergarten in der Nähe.
They attend a kindergarten nearby.
in der Nähe = nearby. "Einen" because maskulin Akkusativ indefinite (ein → einen).
Dat Die Stadt hat viel Geld in den neuen Kindergärten investiert.
The city has invested a lot of money in the new kindergartens.
investieren = to invest. Plural Dativ: article "den"; Kindergarten takes an umlaut (Kindergärten) and adds nothing further, since it already ends in -n.
das Kinn — chin
Plural: die Kinne (rare — mainly used when comparing several people's chins).
Nom Das Kinn tut ihm weh.
His chin hurts.
das Kinn (neutral) = chin · weh tun + Dativ = to hurt. "Das" — neutral Nominativ. Kinn is the subject.
Akk Der Arzt untersucht das Kinn.
The doctor examines the chin.
untersuchen = to examine. Neutral Akkusativ keeps the same form as Nominativ (das → das). Kinn is the direct object.
Dat Paul hat eine Schramme an seinem Kinn.
Paul has a bruise on his chin.
die Schramme, -n = scratch/bruise. "Seinem" — neutral Dativ possessive (sein → seinem, the same pattern as "ein → einem") after "an." The dictionary's own example, unchanged.
Nom Ein kleines Kinn ist typisch für sie.
A small chin is typical for her.
"Ein" — no ending before neutral Nominativ, same as "das."
Akk Nach dem Sturz hatte er ein geschwollenes Kinn.
After the fall, he had a swollen chin.
der Sturz, ü-e = fall · geschwollen = swollen. Neutral Akkusativ indefinite looks identical to Nominativ.
Dat An den Kinnen der Zwillinge sieht man die Ähnlichkeit.
You can see the resemblance in the twins' chins.
der Zwilling, -e = twin · die Ähnlichkeit, -en = resemblance. Plural Dativ: article "den"; Kinn adds "-en" (Kinne → Kinnen) since the plural doesn't already end in -n or -s.
das Kino — movie theater
Plural: die Kinos (adds "-s," like many nouns ending in a vowel: das Auto → die Autos, das Büro → die Büros).
Nom Das Kino in der Stadtmitte ist sehr modern.
The movie theater in the city center is very modern.
das Kino (neutral) = movie theater · die Stadtmitte = city center. "Das" — neutral Nominativ. Kino is the subject.
Akk Wir gehen heute Abend ins Kino.
We're going to the movies tonight.
"Ins" absorbs "das" — neutral Akkusativ (in + das) after "in" for motion/direction. The dictionary's own example; OCR left the old-style lowercase "abend" uncapitalized, restored here to "Abend."
Dat Was wird heute Abend im Kino gezeigt?
What's playing at the movie theater tonight?
zeigen = to show. "Im" absorbs "dem" — neutral Dativ (in + dem) after "in" for location. The dictionary's own example, likewise restored to "Abend."
Nom Ein neues Kino hat letzten Monat eröffnet.
A new movie theater opened last month.
der Monat, -e = month. "Ein" — no ending before neutral Nominativ, same as "das."
Akk Wir besuchen ein Kino am Stadtrand.
We're visiting a movie theater on the edge of town.
der Stadtrand, ä-er = edge of town. Neutral Akkusativ indefinite looks identical to Nominativ.
Dat Der neue Film läuft in den meisten Kinos der Stadt.
The new film is playing in most of the city's movie theaters.
der Film, -e = film · laufen (of a film) = to play/run. Plural Dativ: article "den"; the count-plural "Kinos" already ends in "-s," so no further ending is added.
die Kirche — church
Plural: die Kirchen.
Nom Die Kirche steht seit über 500 Jahren.
The church has stood for over 500 years.
die Kirche (feminin) = church. "Die" — feminin Nominativ. Kirche is the subject.
Akk Viele Leute gehen am Sonntag in die Kirche.
Many people go to church on Sunday.
die Leute (Pl.) = people. Feminine nouns keep the same form in Nominativ and Akkusativ — "gehen in + Akk" is motion into, so "in" takes Akkusativ here. The dictionary's own example, unchanged.
Dat Die Glocke hängt hoch oben in der Kirche.
The bell hangs high up in the church.
die Glocke, -n = bell. "Der" because feminin Dativ (die → der) — here "in" describes location, not motion, so it takes Dativ.
Nom Eine kleine Kirche steht auf dem Hügel.
A small church stands on the hill.
der Hügel, - = hill. "Eine" — feminin Nominativ indefinite; no ending change from the "die" pattern.
Akk Sie besuchen eine alte Kirche in der Altstadt.
They visit an old church in the old town.
die Altstadt, ä-e = old town. Feminine nouns don't change between Nominativ and Akkusativ (eine → eine).
Dat Der Bischof spricht in den kleinen Kirchen der Region.
The bishop speaks in the small churches of the region.
der Bischof, ö-e = bishop · die Region, -en = region. Plural Dativ: article "den"; Kirche adds "-n" in the plural already (Kirchen), so Dativ adds nothing further.
die Kirsche — cherry
Plural: die Kirschen.
Nom Die Kirsche schmeckt süß und saftig.
The cherry tastes sweet and juicy.
die Kirsche (feminin) = cherry · süß = sweet · saftig = juicy. "Die" — feminin Nominativ. Kirsche is the subject.
Akk Sie pflückte die Kirsche vom Baum.
She picked the cherry from the tree.
pflücken = to pick · der Baum, ä-e = tree. Feminine nouns keep the same form in Nominativ and Akkusativ. Kirsche is the direct object. Adapted from the dictionary's own example, which used the bare plural "Kirschen" — singularized here to drill the definite Akkusativ; OCR also garbled the umlaut in "pflückte," corrected here.
Dat An der Kirsche hängt noch ein Blatt.
A leaf is still hanging on the cherry.
das Blatt, ä-er = leaf. "Der" because feminin Dativ (die → der) after "an."
Nom Eine Kirsche liegt auf dem Kuchen.
A cherry sits on top of the cake.
der Kuchen, - = cake. "Eine" — feminin Nominativ indefinite; no ending change from the "die" pattern.
Akk Er isst eine Kirsche nach der anderen.
He eats one cherry after another.
Feminine nouns don't change between Nominativ and Akkusativ (eine → eine).
Dat Der Kuchen wird mit den frischen Kirschen dekoriert.
The cake is decorated with the fresh cherries.
dekorieren = to decorate. Plural Dativ: article "den"; Kirsche adds "-n" in the plural already (Kirschen), so Dativ adds nothing further.
der Klang — sound
Plural: die Klänge (umlaut + "-e") — used for distinct sounds or tones, e.g. musical Klänge.
Nom Der Klang der Glocke ist weit zu hören.
The sound of the bell can be heard far away.
der Klang (maskulin) = sound · die Glocke, -n = bell. "Der" — maskulin Nominativ. Klang is the subject.
Akk Ich mag den Klang dieser Gitarre.
I like the sound of this guitar.
mögen = to like · die Gitarre, -n = guitar. "Den" because maskulin Akkusativ (der → den). Klang is the direct object.
Dat Man erkennt das Instrument an dem Klang.
You can recognize the instrument by its sound.
erkennen = to recognize · das Instrument, -e = instrument. "Dem" because maskulin Dativ (der → dem) after "an."
Nom Ein tiefer Klang erfüllt den Raum.
A deep sound fills the room.
tief = deep · erfüllen = to fill · der Raum, ä-e = room/space. "Ein" — no ending before maskulin Nominativ.
Akk Dieses Instrument hat einen guten Klang.
This instrument has a good sound.
"Einen" because maskulin Akkusativ indefinite (ein → einen). The dictionary's own example, unchanged.
Dat Bei den verschiedenen Klängen erkennt man die Instrumente.
You can recognize the instruments by their different sounds.
verschieden = different/various. Plural Dativ: article "den"; Klang takes an umlaut and adds "-n" (Klänge → Klängen) since the plural doesn't already end in -n or -s.
klar — clear
Regular adjective: klar, klarer, am klarsten. Common in the fixed phrase "Alles klar?" (Everything okay?/Got it?).
Deine Erklärung ist nicht klar.
Your explanation is not clear.
die Erklärung, -en = explanation. Predicate adjective after "ist" — no ending. The dictionary's own example; OCR dropped the umlaut in "Erklärung," corrected here.
die Klarinette — clarinet
Plural: die Klarinetten. Like other instrument names, "Klarinette spielen" often drops the article — the dictionary's own example, "Meine Schwester spielt Klarinette," uses this bare, article-free idiom, the same pattern seen with "Klavier spielen" below.
Nom Die Klarinette liegt in ihrem Koffer.
The clarinet is lying in its case.
die Klarinette (feminin) = clarinet · der Koffer, - = case/suitcase. "Die" — feminin Nominativ. Klarinette is the subject.
Akk Meine Schwester spielt die Klarinette schon seit fünf Jahren.
My sister has already been playing the clarinet for five years.
seit + Dativ = since/for (time). Feminine nouns keep the same form in Nominativ and Akkusativ. Klarinette is the direct object. Adapted from the dictionary's own example, which used the bare, article-free idiom "Klarinette spielen" — reworked here with the definite article to drill the Akkusativ.
Dat Der Ton kommt aus der Klarinette.
The sound comes from the clarinet.
der Ton, ö-e = tone/sound · aus + Dativ = from/out of. "Der" because feminin Dativ (die → der).
Nom Eine alte Klarinette steht im Schrank.
An old clarinet stands in the cupboard.
der Schrank, ä-e = cupboard/closet. "Eine" — feminin Nominativ indefinite; no ending change from the "die" pattern.
Akk Er kauft sich eine neue Klarinette.
He's buying himself a new clarinet.
Feminine nouns don't change between Nominativ and Akkusativ (eine → eine).
Dat Zwischen den beiden Klarinetten besteht ein kleiner Tonunterschied.
There is a small difference in pitch between the two clarinets.
beide = both · der Unterschied, -e = difference. Plural Dativ: article "den"; Klarinette adds "-n" in the plural already (Klarinetten), so Dativ adds nothing further.
die Klasse — class
Plural: die Klassen. Bundled in the dictionary's entry: das Klassenzimmer (classroom), given its own entry next.
Nom Die Klasse hat heute einen Ausflug.
The class has a field trip today.
die Klasse (feminin) = class · der Ausflug, ü-e = field trip/excursion. "Die" — feminin Nominativ. Klasse is the subject.
Akk Der Lehrer unterrichtet die Klasse in Mathematik.
The teacher teaches the class math.
unterrichten = to teach. Feminine nouns keep the same form in Nominativ and Akkusativ. Klasse is the direct object.
Dat Wie viele Studenten sind in dieser Klasse?
How many students are in this class?
der Student, -en (weak noun) = student. "Dieser" — feminin Dativ der-word (dieser follows the same pattern as "der → der"). The dictionary's own example, unchanged.
Nom Eine neue Klasse beginnt im September.
A new class starts in September.
"Eine" — feminin Nominativ indefinite; no ending change from the "die" pattern.
Akk Sie besucht eine Klasse für Anfänger.
She's attending a class for beginners.
der Anfänger, - = beginner. Feminine nouns don't change between Nominativ and Akkusativ (eine → eine).
Dat Der Direktor spricht mit den verschiedenen Klassen der Schule.
The principal talks with the school's various classes.
der Direktor, -en = principal/director. Plural Dativ: article "den"; Klasse adds "-n" in the plural already (Klassen), so Dativ adds nothing further.
das Klassenzimmer — classroom
A compound of "die Klasse" (class) + "das Zimmer" (room) — declines exactly like "das Zimmer": plural die Klassenzimmer (unchanged), Dativ plural die Klassenzimmern. Bundled in the dictionary's entry alongside "Klasse, die."
Nom Das Klassenzimmer ist hell und modern.
The classroom is bright and modern.
das Klassenzimmer (neutral) = classroom · hell = bright. "Das" — neutral Nominativ. Klassenzimmer is the subject.
Akk Die Schüler putzen das Klassenzimmer am Freitag.
The students clean the classroom on Friday.
der Schüler, - = student/pupil · putzen = to clean. Neutral Akkusativ keeps the same form as Nominativ (das → das).
Dat Die Karte hängt an der Wand in dem Klassenzimmer.
The map hangs on the wall in the classroom.
die Wand, ä-e = wall. "Dem" because neutral Dativ (das → dem) after "in."
Nom Ein großes Klassenzimmer wurde renoviert.
A large classroom was renovated.
renovieren = to renovate. "Ein" — no ending before neutral Nominativ, same as "das."
Akk Die Schule braucht ein neues Klassenzimmer.
The school needs a new classroom.
Neutral Akkusativ indefinite looks identical to Nominativ.
Dat In den alten Klassenzimmern gibt es keine Klimaanlage.
There is no air conditioning in the old classrooms.
die Klimaanlage, -n = air conditioning. Plural Dativ: article "den"; Klassenzimmer adds "-n" (Klassenzimmer → Klassenzimmern), the same pattern as "das Zimmer → die Zimmer → den Zimmern," since it doesn't already end in -n or -s.
das Klavier — piano
Plural: die Klaviere. Bundled fixed phrase in the dictionary's entry: Klavier spielen = to play the piano (a bare, article-free noun, the standard way to name playing an instrument) — the dictionary's second example, "Sie spielt sehr gut Klavier," uses exactly this idiom.
Nom Dieses alte Klavier hat immer noch einen schönen Ton.
This old piano still sounds nice.
das Klavier (neutral) = piano · der Ton, ö-e = tone/sound. "Dieses" — neutral Nominativ der-word. Klavier is the subject. The dictionary's own example; OCR dropped the umlaut in "schönen," corrected here.
Akk Sie stimmt das Klavier einmal im Jahr.
She tunes the piano once a year.
stimmen = to tune. Neutral Akkusativ keeps the same form as Nominativ (das → das).
Dat Der Klang kommt aus dem Klavier.
The sound comes from the piano.
der Klang = sound. "Dem" because neutral Dativ (das → dem) after "aus."
Nom Ein altes Klavier steht im Wohnzimmer.
An old piano stands in the living room.
das Wohnzimmer, - = living room. "Ein" — no ending before neutral Nominativ, same as "das."
Akk Wir kaufen ein gebrauchtes Klavier.
We're buying a used piano.
gebraucht = used/secondhand. Neutral Akkusativ indefinite looks identical to Nominativ.
Dat Zwischen den beiden Klavieren im Saal ist kaum Platz.
There's hardly any room between the two pianos in the hall.
der Saal, Säle = hall. Plural Dativ: article "den"; Klavier adds "-n" (Klaviere → Klavieren) since the plural doesn't already end in -n or -s.
kleben — to glue; to paste; to stick
Regular (weak) verb — ich klebe, du klebst, er klebt. Bundled in the dictionary's entry: der Klebstoff (glue/paste), the related noun, given its own entry next. No example sentence was given for this entry in the source, so both examples below are newly written.
Sie klebt das Poster an die Wand.
She sticks the poster to the wall.
das Poster, - = poster · die Wand, ä-e = wall.
Bitte klebe die Briefmarke auf den Umschlag.
Please stick the stamp onto the envelope.
die Briefmarke, -n = stamp · der Umschlag, ä-e = envelope.
der Klebstoff — glue; paste
Plural: die Klebstoffe (referring to different types of adhesive). Bundled in the dictionary's entry alongside "kleben." No example sentence was given for this entry in the source, so all six examples below are newly written.
Nom Der Klebstoff trocknet schnell.
The glue dries quickly.
der Klebstoff (maskulin) = glue/paste · trocknen = to dry. "Der" — maskulin Nominativ. Klebstoff is the subject.
Akk Sie benutzt den Klebstoff für die Bastelarbeit.
She uses the glue for the craft project.
benutzen = to use · die Bastelarbeit, -en = craft project. "Den" because maskulin Akkusativ (der → den).
Dat Die Teile werden mit dem Klebstoff verbunden.
The parts are joined with the glue.
das Teil, -e = part · verbinden = to join/connect. "Dem" because maskulin Dativ (der → dem).
Nom Ein starker Klebstoff hält die Teile zusammen.
A strong glue holds the parts together.
stark = strong · zusammenhalten = to hold together. "Ein" — no ending before maskulin Nominativ.
Akk Wir brauchen einen wasserfesten Klebstoff.
We need a waterproof glue.
wasserfest = waterproof. "Einen" because maskulin Akkusativ indefinite (ein → einen).
Dat Im Baumarkt gibt es viele Regale mit den verschiedenen Klebstoffen.
In the hardware store there are many shelves with the various types of glue.
der Baumarkt, ä-e = hardware store · das Regal, -e = shelf. Plural Dativ: article "den"; Klebstoff adds "-n" (Klebstoffe → Klebstoffen) since the plural doesn't already end in -n or -s.