coma

  1. Noun.  A state of sleep from which one may not wake up, usually induced by some form of trauma.
  2. Noun.  (astronomy) A cloud of dust surrounding the nucleus of a comet.
  3. Noun.  (optics) A defect characterized by diffuse, pear-shaped images that should be points.

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This entry was last updated on RefTopia from its source on 3/20/2012.