[usually before noun] a piece of equipment that produces a powerful narrow line of light. It is used for cutting hard substances, directing the paths of missiles, and in medical operations
The cancer cells are destroyed by a tiny laser.
New laser eye surgery can correct your vision.
laser beam: Computer technology and laser beams can be used to control the weather.
laser display (=patterns of coloured lights): The crowd enjoyed the fireworks and the laser display.
Synonyms and related words