buzzer Meaning, Definition & Usage

  1. noun a push button at an outer door that gives a ringing or buzzing signal when pushed
    doorbell; bell.
  2. noun a signaling device that makes a buzzing sound

WordNet

Buzz"er noun
Definitions
  1. One who, or that which, buzzes; a whisperer; a talebearer.
    And wants not buzzers to infect his ear With pestilent speeches of his father's death. Shak.

Webster 1913