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maser
CIDE DICTIONARY
maser, n.
- Same as Mazer. [1913 Webster]
- An electronic device producing coherent monochromatic microwave radiation; it produces less noise than other forms of
microwave oscillator . [PJC]
OXFORD DICTIONARY
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
For further exploring for "maser" in Webster Dictionary Online
