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English definition of “laser”

laser

noun [C]     /ˈleɪ.zər/ US  /-zɚ/
B2 (a device that produces) a powerful, narrow beam of light that can be used as a tool to cut metal, to perform medical operations, or to create patterns of light for entertainment: laser beam laser surgeryOptics, microscopy and lasersEyesight, glasses and lenses
(Definition of laser noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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