Search Result for "foucault pendulum":
Wordnet 3.0

NOUN (1)

1. pendulum with a long wire; can swing in any direction; the change in the swing plane demonstrates the earth's rotation; 



WordNet (r) 3.0 (2006):

Foucault pendulum
    n 1: pendulum with a long wire; can swing in any direction; the
         change in the swing plane demonstrates the earth's rotation