nounWord forms: plural ˈorreries
a mechanical apparatus
which illustrates with balls of various sizes the relative motions
and positions of the earth, moon
, sun, etc.
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'orrery'after Charles Boyle, Earl of Orrery (1676-1731), for whom one was made