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