1. astronomy object in orbit round star: an astronomical object that orbits a star and does not shine with its own light, especially one of those orbiting the Sun in the solar system
2. astrology astrological influence: in astrology, the Sun, the Moon, or any of the planets of the solar system, except Earth, considered to influence events on Earth and the fate or character of individual people
[12th century. Via French< Latin planeta "planet, wandering star" < Greek planētēs "wanderer"]
Cultural Note
The Planets, an orchestral work (1914-1916) by British composer Gustav Holst. This suite for orchestra, organ, and chorus is divided into seven movements, each of which represents the astrological character of a planet with appropriate music.