coma

Noun
  1. A state of deep and often prolonged unconsciousness;
    Usually the result of disease or injury (synset 105688034)
    is a type of: unconsciousness - a state lacking normal awareness of the self or environment
    subtypes:
    same as: comatoseness
  2. (botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds) (synset 113111155)
    referred to in: botany, phytology - the branch of biology that studies plants
    is a type of: tuft, tussock - a bunch of hair or feathers or growing grass
  3. (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet;
    Forms as the comet approaches the sun and is warmed (synset 109273908)
    referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
    is a type of: cloud - any collection of particles (e.g., smoke or dust) or gases that is visible
    is a part of: comet - (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit

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