type of electromagnetic wave, 1931, coined in English from micro- + wave (n.). First record of microwave oven is from 1961; microwave as short for this is attested from 1974; as a verb, from 1976.[microwave etymology, microwave origin, 英语词源]
short for nuclear weapon, 1959, U.S. military slang (see nuclear). The verb is attested from 1962; the slang sense of "to cook in a microwave oven" is from 1987. Related: Nuked; nuking.