optical maser

noun Physics.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage
Science Dictionary
optical maser  
A laser that produces visible radiation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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00:10
optical maser is always a great word to know.
So is interrobang. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Example sentences
They called their invention an optical maser--basing the name on an earlier technique for amplifying microwaves.
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