laser Hear it!

laser definition

☆ la·ser (lā′zər)

noun

a device containing a substance the majority of whose atoms or molecules can be put into an excited energy state, allowing the substance to emit coherent light of a precise wavelength in an intense, narrow beam

Etymology: l(ight) a(mplification by) s(timulated) e(mission of) r(adiation)

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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