Webster's English Dictionary

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comet

com.et \'ka:m-*t\ \-*-.ter-e-\ \k*-'met-ik, ka:-\ n [ME comete, fr. OE 
   cometa, fr. L, fr. Gk kome-te-s, lit]., long-haired, fr. koman to wear long 
   hair, fr. kome- hair : a celestial body that consists of a fuzzy head usu. 
   surrounding a bright  nucleus, that often when in the part of its orbit 
   near the sun develops a long tail which points away from the sun, and that 
   has an orbit varying in eccentricity between nearly round and parabolic - 
   com.e.tary aj