Comet

Noun

 * 1)  A celestial body consisting mainly of ice, dust and gas in an (usually very eccentric) orbit around the Sun and having a "tail" of matter blown back from it by the solar wind as it approaches the Sun.
 * 2) A celestial phenomenon with the appearance given by the orbiting celestial body.

Derived terms

 * cometary

Related terms

 * periodic comet

Thesaurus
Aldebaran, Canicula, Dog Star, Hesper, Hesperus, Lucifer, North Star, Phosphor, Phosphorus, Polaris, Sirius, Venus, Vesper, celestial body, daystar, evening star, fixed stars, heavenly body, living sapphires, lodestar, morning star, orb, polar star, polestar, sphere, starry host, stars