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microwave British & World English

An electromagnetic wave with a wavelength in the range 0.001-0.3 m, shorter than that of a normal radio wave but longer than those of infrared radiation. Microwaves are used in radar, in communications, and for heating in microwave ovens and in various industrial processes

microwave background British & World English

A weak uniform microwave radiation which is detectable in nearly every direction of the sky. It is believed to be evidence of the Big Bang

microwave oven in microwave British & World English

An oven that uses microwaves to cook or heat food