Pronunciation: (pik'ôf", -of"), [key]
1. Baseball.a play in which a base runner, caught off base, is tagged out by an infielder on a quick throw, usually from the pitcher or catcher.
2. Electronics.a mechanism that senses mechanical motion and produces a corresponding electric signal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.