Similar words: laser, eraser, a series of, rubber eraser, purchase requisition, mask, mast, mass. Meaning: ['meɪzə(r)] 
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.
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. 
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(31) In this paper, we study the magnetron cavity used in atomic hydrogen maser.
(32) The paper describes the hydrogen storage principle of the LaNi alloys and its application in the Hydrogen Maser of Shanghai Astronomical Observatory .