Com·et n. Astron. A member of the solar system which usually moves in an elongated orbit, approaching very near to the sun in its perihelion, and receding to a very great distance from it at its aphelion. A comet commonly consists of three parts: the nucleus, the envelope, or coma, and the tail; but one or more of these parts is frequently wanting. See Illustration in Appendix.
n : (astronomy) a relatively small extraterrestrial body
consisting of a frozen mass that travels around the sun
in a highly elliptical orbit