Pronunciation: (pen'ju-lum, pen'du-), [key]
1. a body so suspended from a fixed point as to move to and fro by the action of gravity and acquired momentum.
2. Horol.a swinging lever, weighted at the lower end, for regulating the speed of a clock mechanism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.