Definition of Foucault pendulum
: a freely swinging pendulum that consists of a heavy weight hung by a long wire and that swings in a constant direction which appears to change showing that the earth rotates
Origin of foucault pendulum
J. B. L. Foucault
First Known Use: 1931
Learn More about foucault pendulum
Britannica.com: Encyclopedia article about "Foucault pendulum"
Seen and Heard
What made you want to look up Foucault pendulum? Please tell us where you read or heard it (including the quote, if possible).