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 Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for maser

Historical Examples of maser

  • 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 for maser

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

Word Origin and History for maser

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

Online Etymology Dictionary, © 2010 Douglas Harper

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.