foucault : Idioms & Phrases


foucault pendulum

  • 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

  • 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.
WordNet