[mey-zer] /ˈmeɪ zər/

a device for amplifying electromagnetic waves by stimulated emission of radiation.
a device for amplifying microwaves, working on the same principle as a laser

1955, acronym from “microwave amplification (by) stimulated emission (of) radiation.”
Short for microwave amplification by stimulated emission of radiation. A device that generates coherent microwaves using the same principles as a laser. Masers are used in a variety of applications, including in atomic clocks. Natural masers are found in outer space when water or other substances are excited by radiation from a star or by the energy of a collision.
microwave amplification by stimulated emission of radiation


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