| Planet 1. (n.) A celestial body which revolves about the sun in an orbit of a moderate degree of eccentricity. It is distinguished from a comet by the absence of a coma, and by having a less eccentric orbit. See Solar system. 2. (n.) A star, as influencing the fate of a men. Thesaurus Entries Earth, Jupiter, Mars, Mercury, Neptune, Pluto, Saturn, Uranus, Venus, asteroid, globe, inferior planet, major planet, minor planet, planetoid, secondary planet, solar system, superior planet, terrestrial planet, wanderer, world |