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[mey-zer] /ˈmeɪ zər/
a device for amplifying electromagnetic waves by stimulated emission of radiation.
Compare laser.
Origin of maser
1950-55; m(icrowave) a(mplification by) s(timulated) e(mission of) r(adiation) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for maser
Historical Examples
  • Rhazes quoted maser Djawah freely and evidently trusted his declarations implicitly.

  • The mazer-bowls were made from maple-wood, so named from the German maser, a spotted wood.

    Cups and their Customs George Edwin Roberts
  • "Don't try and buff me, dinAlt," the maser barrel pushed harder against his back.

    The Ethical Engineer Henry Maxwell Dempsey
British Dictionary definitions for maser


a device for amplifying microwaves, working on the same principle as a laser
Word Origin
C20: m(icrowave) a(mplification by) s(timulated) e(mission of) r(adiation)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for maser

1955, acronym from "microwave amplification (by) stimulated emission (of) radiation."

Online Etymology Dictionary, © 2010 Douglas Harper
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maser in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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