orrery Meaning, Definition & Usage

  1. noun 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

WordNet

Or"re*ry noun
Etymology
So named in honor of the Earl of Orrery.
Wordforms
plural Orreries
Definitions
  1. 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.

Webster 1913