Webster's English Dictionary

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coma

1. co.ma \'ko--m*\ n [NL, fr. Gk ko-ma deep sleep] 1: a state of profound 
   unconsciousness caused by disease, injury, or poison  2: a state of mental 
   or physical sluggishness : TORPOR 
2. coma \-.me-, -.mi-\ n or co.mae [L, hair, fr. Gk kome-] pl  1: a tufted 
   bunch (as of hairs)  2: the head of a comet usu. containing a nucleus  3: 
   spherical aberration in which the image of a point source is a comet-sha 
   ped blur