WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a signaling device that makes a buzzing sound
noun.
a push button at an outer door that gives a ringing or buzzing signal when pushed
Word Usage
"Miami, though, held the Hawks to five points, three on free throws, in the rest of the quarter, and when Jones beat the buzzer from the right wing with a jumper, the Heat took a 59-54 lead into the fourth quarter."