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microwave mi·cro·wave (mī'krə-wāv', -krō-)
A high-frequency electromagnetic wave, one millimeter to one meter in wavelength, intermediate between infrared and shortwave radio wavelengths. v. mi·cro·waved, mi·cro·wav·ing, mi·cro·waves
To cook or heat using microwaves.
An electromagnetic wave with a frequency in the range of 100 megahertz to 30 gigahertz (lower than infrared but higher than other radio waves). Microwaves are used in radar, radio transmission, cooking, and other applications. Microwaves are generated naturally by many astronomical phenomena and are found in cosmic background radiation. See more at electromagnetic spectrum.
Electromagnetic waves with a wavelength on the order of a few inches. Microwaves are longer than infrared radiation and shorter than radio waves. Microwaves are used extensively for communication, both in satellite television and for the transmission of long-distance telephone signals. In a microwave oven, food is cooked by the heat generated when the water in the food absorbs microwaves.