(n)a bluish discoloration of the skin and mucous membranes; a sign that oxygen in the blood is dangerously diminished (as in carbon monoxide poisoning)
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
‖n. [ NL. See Cyanic. ] (Med.) A condition in which, from insufficient aëration of the blood, the surface of the body becomes blue. See Cyanopathy. [ 1913 Webster ]