noun
microwave oven
Common everyday term for a microwave oven. Derived from 'electric range'.
冷めたご飯を電子レンジで温める。
I heat up cold rice in the microwave.
この電子レンジはオーブン機能も付いている。
This microwave oven also has an oven function.
オーブンレンジ is a combination microwave and oven, while 電子レンジ is a standard microwave.
From English 'electric range', adapted into Japanese as 電子 (electronic) + レンジ (range).