/awr"euh ree, or"-/ , n. , pl. orreries .
1. an apparatus for representing the positions, motions, and phases of the planets, satellites, etc., in the solar system.
2. any of certain similar machines, as a planetarium.
[ 1705-15; named after Charles Boyle, Earl of Orrery (1676-1731), for whom it was first made ]