maser(n = noun.artifact) - 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;
is a kind of amplifier
has particulars: gas maser
1. Same as Mazer. [1913 Webster]
2. An electronic device producing coherent monochromatic microwave radiation; it produces less noise than other forms of
maser, n. a device using the stimulated emission of radiation by excited atoms to amplify or generate coherent monochromatic electromagnetic radiation in the microwave range (cf. LASER).
Etymology:
microwave amplification by the stimulated emission of radiation