Orreries

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Orrery \Or"re*ry\, n.; pl. {Orreries}. [So named in honor of the
     Earl of Orrery.]
     An apparatus which illustrates, by the revolution of balls
     moved by wheelwork, the relative size, periodic motions,
     positions, orbits, etc., of bodies in the solar system.
     [1913 Webster]