Longman Dictionary of Contemporary English homepage

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

laser

noun
     
la‧ser [countable]
1T 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

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