Meaning of LASER in English

ˈlāzə(r) noun

( -s )

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

: a device that utilizes the natural oscillations of atoms for amplifying or generating electromagnetic waves in the region of the spectrum from the ultraviolet to the far-infrared including the visible region

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.