'Buzzer' definitions:

Definition of 'buzzer'

From: WordNet
noun
A push button at an outer door that gives a ringing or buzzing signal when pushed [syn: doorbell, bell, buzzer]
noun
A signaling device that makes a buzzing sound

Definition of 'Buzzer'

From: GCIDE
  • Buzzer \Buzz"er\ (b[u^]z"[~e]r), n. One who, or that which, buzzes; a whisperer; a talebearer. [1913 Webster]
  • And wants not buzzers to infect his ear With pestilent speeches of his father's death. --Shak. [1913 Webster]

Synonyms of 'buzzer'

From: Moby Thesaurus