Coma /(kō"mȧ)/

Co·ma

Coma

n.
  1. A state of profound insensibility from which it is difficult or impossible to rouse a person. See Carus.

Coma

n.
  1. The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet. (Astron.)
  2. A tuft or bunch, -- as the assemblage of branches forming the head of a tree; or a cluster of bracts when empty and terminating the inflorescence of a plant; or a tuft of long hairs on certain seeds. (Bot.)

Phrases & Compounds
Coma Berenices
a small constellation north of Virgo; -- called also Berenice's Hair.