foucault : Idioms & Phrases
foucault pendulum
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noun pendulum with a long wire; can swing in any direction; the change in the swing plane demonstrates the earth's rotation
WordNet
jean bernard leon foucault
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noun French physicist who determined the speed of light and showed that it travels slower in water than in air; invented the Foucault pendulum and the gyroscope (1819-1868)
Foucault.