/ Dictionary / Index F Foucault pendulum: Meaning and Definition of Find definitions for: Foucault' pen'dulum Pronunciation: [key] — Physics. Physics. a pendulum that demonstrates the rotation of the earth by exhibiting an apparent change in its plane of oscillation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Foucault Foucquet Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language