comet
noun
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How to pronounce comet:

Definition of comet:

comet (noun):
(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit.
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

Synonyms for comet:

estraterrestrial body
extraterrestrial object
nucleus