• noun
• synonym
• antonym

• Foucault pendulum (noun)
  1. pendulum with a long wire; can swing in any direction; the change in the swing plane demonstrates the earth's rotation
• Foucault, Jean Bernard Léon
  1. (1819-68) a French scientist who studied the speed of light. He invented Foucault's Pendulum, an object that swings on a wire and shows how the Earth spins around. He also invented the GYROSCOPE .
• Jean Bernard Leon Foucault (noun)
  1. 1819-1868 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
• More