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maser (n.)

a type of laser that emits microwaves, 1955, acronym from "microwave amplification (by) stimulated emission (of) radiation." Related: Mase (v.).

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Definitions of maser from WordNet

maser (n.)
an acronym for microwave amplification by stimulated emission of radiation; an amplifier that works on the same principle as a laser and emits coherent microwave radiation;
From wordnet.princeton.edu