comet: [13] Comet means literally ‘the longhaired one’. Greek kómē meant ‘hair’, but it was also applied metaphorically to the tail of a comet, which was thought of as streaming out behind like a luxuriant head of hair being blown by the wind. Hence an astēr kométēs ‘longhaired star’ was the name given to a comet. Eventually the adjective kométēs came to stand for the whole phrase, and it passed via Latin comēta and Old French comete into English. [comet etymology, comet origin, 英语词源]