comet

Từ điển WordNet v3.1 - WordNet Dictionary

noun

(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit (Freq. 1)
• Derivationally related forms:
cometary, cometic
• Topics:
astronomy, uranology
• Hypernyms:
extraterrestrial object, estraterrestrial body
• Part Meronyms:
coma, nucleus