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laser (n.)

1960, acronym for "light amplification by stimulated emission of radiation," on pattern of maser (1955). A corresponding verb, lase, was coined by 1962. Related: Lasered; lasering. Laser disc recorded from 1980. Earlier laser was the name of a type of gum-resin from North Africa used medicinally (1570s), from Latin; still earlier it was an Old English and Middle English name for some weed, probably cockle.

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Definitions of laser from WordNet

laser (n.)
an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light;
Synonyms: optical maser
From wordnet.princeton.edu