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Definition of Cyanosis

Babylon English

blueness of the skin caused by lack of oxygen (Medicine)
Cyanosis Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
A condition in which, from insufficient a/ration of the blood, the surface of the body becomes blue. See Cyanopathy.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

\cy`a*no"sis\ (s?`?-n?"s?s), n. [nl. see cyanic.] (med.) a condition in which, from insufficient aëration of the blood, the surface of the body becomes blue. see cyanopathy.

WordNet 2.0

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)
(hypernym) symptom
(hyponym) acrocyanosis, Raynaud's sign
(part-holonym) carbon monoxide poisoning
Cyanosis Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Cyanosis is the appearance of a blue or purple coloration of the skin or mucous membranes due to the tissues near the skin surface having low oxygen saturation. Based on Lundsgaard and Van Slyke's work, it is classically described as occurring if 5.0 g/dL of deoxyhemoglobin or greater is present. This was based on an "estimate" of capillary saturation based on a mean of arterial versus peripheral venous blood gas measurements. Since estimation of hypoxia is usually now based either on arterial blood gas measurement or pulse oximetry, this is probably an overestimate, with evidence that levels of 2.0 g/dL of deoxyhemoglobin may reliably produce cyanosis. Since, however, the presence of cyanosis is dependent upon there being an absolute quantity of deoxyhemoglobin, the bluish color is more readily apparent in those with high hemoglobin counts than it is with those with anemia. Also the bluer color is more difficult to detect on deeply pigmented skin. When signs of cyanosis first appear, such as on the lips or fingers, intervention should be made within 3–5 minutes because a severe hypoxia or severe circulatory failure may have induced the cyanosis.

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Cyanosis Definition from Entertainment & Music Dictionaries & Glossaries
English to Federation-Standard Golic Vulcan
(ritsuri) pla-wadi-nosh
Cyanosis Definition from Medicine Dictionaries & Glossaries
NCI Dictionary of Cancer Terms
Blue-colored skin caused by too little oxygen in the blood. 
A Service of the National Cancer Institute.
Lung Diseases Glossary
Bluish color of the skin due to insufficient oxygen in the blood.
Context: Bronchopulmonary Dysplasia; Chronic Obstructive Pulmonary Disease; Pulmonary Arterial Hypertension 
Sources: DHHS, NIH and NHLBI
Hepatitis Central (TM) Liver Disease Medical Glossary
Blueness of skin (extremities = peripheral) without or with (= central) mucous membranes such as the lips and mouth
Aids Glossary
a dark purplish coloration of the skin and mucous membranes due to deficient oxygen in the blood.