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English definition of “laser”

laser

noun [C]     /ˈleɪzər/
a device that produces a powerful narrow beam of light that can be used as a tool , for example to cut metal , to perform medical operations , etc. The beam of light is also known as a laser: It shines a laser beam on to the surface of the disc to read the pattern of the bumps . Our team are engaged in the research of laser technology . They now use a laser gun for reading barcodes.
(Definition of laser noun from the Cambridge Business English Dictionary © Cambridge University Press)
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