Etymology
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cyanosis (n.)

"blue disease," the "blue jaundice" of the ancients, 1820, Medical Latin, from Greek kyanosis, from kyanos "dark blue color" (see cyan) + -osis. Also cyanopathy. It is caused by imperfect circulation and oxygenation of the blood.

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Definitions of cyanosis

cyanosis (n.)
a bluish discoloration of the skin and mucous membranes;
From wordnet.princeton.edu