Definition of “microwave” - Learner’s Dictionary

microwave

noun [ C ] uk us /ˈmaɪkrəʊweɪv/
OVEN (also microwave oven, uk us )

an electric oven that uses waves of energy to cook or heat food

WAVE

a very short wave similar to a radio wave that is used for sending information and cooking

(Definition of “microwave noun” from the Cambridge Learner's Dictionary © Cambridge University Press)