Source: The Collaborative International Dictionary of English v.0.48
Cyanosis \Cy`a*no"sis\ (s?`?-n?"s?s), n. [NL. See Cyanic.]
(Med.)
A condition in which, from insufficient a["e]ration of the
blood, the surface of the body becomes blue. See
Cyanopathy.
[1913 Webster]
cyanosis
n 1: a bluish discoloration of the skin and mucous membranes; a
sign that oxygen in the blood is dangerously diminished (as
in carbon monoxide poisoning)