Etymology
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buzzer (n.)

c. 1600, "buzzing insect," agent noun from buzz (v.). Used 1870s in Britain of steam-powered whistles used to call or dismiss factory workers. In reference to electricity-powered mechanical devices that buzz, from 1882.

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Definitions of buzzer

buzzer (n.)
a push button at an outer door that gives a ringing or buzzing signal when pushed;
Synonyms: doorbell / bell
buzzer (n.)
a signaling device that makes a buzzing sound;
From wordnet.princeton.edu