Dictionary
sim'ple pen'dulum
Physics.
a hypothetical apparatus consisting of a point mass suspended from a weightless, frictionless thread whose length is constant, the motion of the body about the string being periodic and, if the angle of deviation from the original equilibrium position is small, representing simple harmonic motion (distinguished from
physical pendulum).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.