comet n a celestial body that travels around the sun, usually in a highly elliptical orbit: thought to consist of a solid frozen nucleus part of which vaporizes on approaching the sun to form a gaseous luminous coma and a long luminous tail (C13: from Old French comète, from Latin cometa, from Greek kometes long-haired, from kome hair)
cometary, cometic adj
n a comet revolving around the sun in a period of about 76 years and last seen in 1985--86
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