Meaning of LASER in English

la ‧ ser /ˈleɪzə $ -ər/ BrE AmE noun [countable]

[ Date: 1900-2000 ; Origin: From " light amplification by stimulated emission of radiation " ]

1 . a piece of equipment that produces a powerful narrow beam of light that can be used in medical operations, to cut metals, or to make patterns of light for entertainment:

laser surgery

2 . a beam of light produced by a laser

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.