orrery definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
noun pl. orreries
a mechanical apparatus which illustrates with balls of various sizes the relative motions and positions of the earth, moon, sun, etc.
Origin: after Charles Boyle, Earl of Orrery (1676-1731), for whom one was made
orrery definition by American Heritage Dictionary
noun pl. or·re·ries
A mechanical model of the solar system.
Origin: After Charles Boyle, Fourth Earl of Orrery (1676-1731), for whom one was made.