Foucault Pendulum Definition
noun
A pendulum consisting of a heavy weight on the end of a long wire hanging from a fixed point, of the kind invented by Jean Foucault to demonstrate that the earth is rotating: although the weight continues to swing within a single plane, its path appears to an observer to shift progressively over time.
Webster's New World
Foucault's pendulum.
Wiktionary
Origin of Foucault Pendulum
After Jean Bernard Léon Foucault
From American Heritage Dictionary of the English Language, 5th Edition
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