Simple Definition of comet
: an object in outer space that develops a long, bright tail when it passes near the sun
Full Definition of comet
: a celestial body that appears as a fuzzy head usually surrounding a bright nucleus, that has a usually highly eccentric orbit, that consists primarily of ice and dust, and that often develops one or more long tails when near the sun
Origin of comet
Middle English comete, from Old English cometa, from Latin, from Greek komētēs, literally, long-haired, from koman to wear long hair, from komē hair
First Known Use: before 12th century
COMET Defined for Kids
Definition of comet for Students
: a small bright heavenly body that develops a cloudy tail as it moves in an orbit around the sun
History for comet
The tail of a comet looks rather like long hair streaming behind the head. The ancient Greeks named comets with the word komētēs, which means literally “long-haired.” This word comes from the noun komē, “hair on one's head” or “shock of hair.” The English word comet came from the Greek name for comets.
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