The definition of a laser is a tool that creates a strong light beam made of atoms and molecules in an excited energy state.
(noun)An example of a laser is a tool for removing unwanted hairs.
See laser in Webster's New World College Dictionary
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noun
Origin: l(ight) a(mplification by) s(timulated) e(mission of) r(adiation)
See laser in American Heritage Dictionary 4
noun
Origin:
Origin: l(ight) a(mplification by) s(timulated) e(mission of) r(adiation)
.laser
diagram showing the output stage of a ruby laser
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