noun
oven
B1
Ofen: a masculine noun meaning oven or (in some contexts) stove. Singular der Ofen; plural Öfen (umlaut + -en). Genitive des Ofens, dative dem Ofen; plural dative den Öfen. Standard declension patterns; plural formation involves umlaut and -en. Used for cooking or heating devices.
Examples
Der Kuchen ist im Ofen.
The cake is in the oven.
Der Braten muss noch eine Stunde im Ofen bleiben.
The roast still needs to stay in the oven for an hour.
Die Pizza lag im Ofen, weil niemand die Tür geöffnet hatte.
The pizza was in the oven because nobody had opened the door.
Details
Mnemonics
Picture a hot oven with a loaf of bread inside and the label 'Der Ofen' on the door.
Sounds like English 'oven' (very similar), just remember the German pronunciation.
der (masculine) Ofen — imagine a burly baker (male) standing proudly by the oven to remember 'der'.
Notes
Plural of Ofen is Öfen. Common everyday noun used for cooking and heating. The stem takes an -s in the genitive singular (des Ofens).