microwave UK /ˈmaɪkɹəʊˌweɪv/US /ˈmaɪkɹoʊˌweɪv/verb 2noun 2forms 3phrases 1 verb2 •To cook (something) in a microwave oven.A vengeful mother-of-three has been jailed for 168 days after being convicted of killing a neighbour's kitten by microwaving the 10-week-old pet. — 2011 •(slang) To provide minimal preparation for implementation, deeming full or extensive preparation as unnecessary. noun2 •An electromagnetic wave with wavelength between that of infrared light and radio waves.Many radar systems use a combination of radio waves and microwaves. •Ellipsis of microwave oven.Just put it in the microwave for 30 seconds and it's ready to eat. formsmicrowaved · microwaving · microwaves Phrases with microwave microwave upTo cook (something) by microwaving.