1. Plural of armilla; in astronomy, a graduated ring or circle used as an instrument for measuring angles and positions of celestial bodies.
Usage: technical; astronomy; historical
2. In ancient Rome, bracelets or arm rings worn as ornaments or insignia of rank.
Usage: historical; archaic

Examples

• Medieval astronomers used armillas to map the positions of stars.
• The armillary sphere contained multiple armillas for precise celestial measurement.
• Roman soldiers wore golden armillas as symbols of their military status.
• Ancient texts describe armillas as valuable ornaments among the nobility.
• The museum displayed replicas of brass armillas used in early astronomical observation.