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]

WordNet (r) 3.0 (2006):

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)

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "cyanosis":
   abscess, ague, anemia, ankylosis, anoxia, apnea, asphyxiation,
   asthma, ataxia, atrophy, azure, azureness, backache, bleeding,
   blennorhea, blue, blueness, bluishness, cachexia, cachexy, chill,
   chills, colic, constipation, convulsion, coughing, diarrhea,
   dizziness, dropsy, dysentery, dyspepsia, dyspnea, edema,
   emaciation, fainting, fatigue, fever, fibrillation, flux, growth,
   hemorrhage, high blood pressure, hydrops, hypertension,
   hypotension, icterus, indigestion, inflammation, insomnia, itching,
   jaundice, labored breathing, lividity, lividness,
   low blood pressure, lumbago, marasmus, nasal discharge, nausea,
   necrosis, pain, paralysis, pruritus, rash, rheum, sclerosis,
   seizure, shock, skin eruption, sneezing, sore, spasm, tabes,
   tachycardia, tumor, upset stomach, vertigo, vomiting, wasting