Buzzer meaning

bŭzər
Frequency:
An electrical device that makes a buzzing sound as a signal.
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An electric signaling device, such as a doorbell, that makes a buzzing sound.
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One who, or that which, buzzes; an insect that buzzes.
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A device that makes a buzzing sound.

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(US slang) A police badge.
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Origin of buzzer

  • From buzz +‎ -er.

    From Wiktionary