maser

[mey-zer]
noun
a device for amplifying electromagnetic waves by stimulated emission of radiation.
Compare laser.


Origin:
1950–55; m(icrowave) a(mplification by) s(timulated) e(mission of) r(adiation)

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World English Dictionary
maser (ˈmeɪzə)
 
n
a device for amplifying microwaves, working on the same principle as a laser
 
[C20: m(icrowave) a(mplification by) s(timulated) e(mission of) r(adiation)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

maser
1955, acronym from "microwave amplification (by) stimulated emission (of) radiation."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
maser   (mā'zər)  Pronunciation Key 
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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American Heritage
Abbreviations & Acronyms
maser
microwave amplification by stimulated emission of radiation
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
They called their invention an optical maser--basing the name on an earlier technique for amplifying microwaves.
It turns out that this signal is generated in the path between one maser and the phase comparator.
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