Definitions for orreryˈɔr ə ri, ˈɒr-
Random House Webster's College Dictionary
or•rer•yˈɔr ə ri, ˈɒr-(n.)(pl.)-rer•ies.
an apparatus for representing with movable balls the positions, motions, and phases of the bodies of the solar system.
Origin of orrery:
1705–15; after Charles Boyle, Earl of Orrery (1676–1731), for whom it was first made
planetarium consisting of an apparatus that illustrates the relative positions and motions of bodies in the solar system by rotation and revolution of balls moved by wheelwork; sometimes incorporated in a clock
a clockwork model of the solar system
Origin: Named after Charles Boyle, 4th Earl of Orrery (1676-1731), for whom such a device was made.
The Nuttall Encyclopedia
is a mechanical toy which exhibits, by an arrangement of rods, balls, and toothed wheels, the sun, the planets, and their moons, all performing their respective motions; so named after the Earl of Orrery, for whom Charles Boyle made the first one in 1715.