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Noun: coma (comas,comae)  kow-mu
  1. A state of deep and often prolonged unconsciousness; usually the result of disease or injury
    - comatoseness
     
  2. (botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds)
     
  3. (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed
     
  4. (optics) an aberration giving a V-shaped flare to an image (e.g. a star in an astronomical observation)

Derived forms: comas, comae

Type of: cloud, tuft, tussock, unconsciousness

Part of: comet

Encyclopedia: Coma, post-head injury