D defs.my
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Entry 3 senses · 2 variants Webster, 1913

Coma

/(kō"mȧ)/ · Co·ma · IPA /ˈkoʊmə/
01 n. A state of profound insensibility from which it is difficult or impossible to rouse a person. See Carus.
  1. 1.
    A state of profound insensibility from which it is difficult or impossible to rouse a person. See Carus. See: Carus
02 n. The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet.
  1. 1.
    The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet.(Astron.)
  2. 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.