American English

Definition of laser noun from the Oxford Advanced American Dictionary



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a device that gives out light in which all the waves oscillate (= change direction and strength) together, typically producing a very strong line of light that can be used for cutting metal, in medical operations, etc. a laser beam a laser navigation device The bar codes on the products are read by lasers. a laser show (= laser used as entertainment) She had laser surgery on her eye.
See the Oxford Advanced Learner's Dictionary entry: laser