cyanosis cy·a·no·sis (sī'ə-nō'sĭs) n. A bluish discoloration of the skin and mucous membranes resulting from inadequate oxygenation of the blood.
hypercyanotic hy·per·cy·a·not·ic (hī'pər-sī'ə-nŏt'ĭk) adj. Characterized by extreme cyanosis.