1. Plural of orrery; mechanical models or devices that represent the motions and positions of celestial bodies in the solar system.
Usage: Usually capitalized when referring to a specific named orrery; commonly used in educational and museum settings.

Examples

• The museum's collection includes several antique orreries from the 18th century.
• Students studied the solar system using brass orreries in the science classroom.
• The planetarium displayed working orreries to demonstrate planetary orbits.
• Orreries were popular educational tools before modern planetariums were invented.
• The craftsman built intricate orreries with gears and moving spheres to represent each planet.