| comet | | |
| n. | 1. comet | (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit. |
| ~ astronomy, uranology | the branch of physics that studies celestial bodies and the universe as a whole. |
| ~ coma | (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed. |
| ~ estraterrestrial body, extraterrestrial object | a natural object existing outside the earth and outside the earth's atmosphere. |
| ~ nucleus | (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail. |
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