la·ser
| \ ˈlā-zər
\
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Definition of laser
(Entry 1 of 2)
1
: a device that utilizes the natural oscillations of atoms or molecules between energy levels for generating a beam of coherent electromagnetic radiation usually in the ultraviolet, visible, or infrared regions of the spectrum
also
: the beam of coherent radiation itself
The cesium fluoresced. This told them they had the necessary population of excited atoms to produce a laser. — Nick Taylor
2
: something resembling a laser beam in accuracy, speed, or intensity
threw a laser into the end zone a laser stare