What does cyanose mean?
Cyanose refers to the bluish discolouration of the skin, lips, nail beds, and mucous membranes that occurs when the blood carries insufficient oxygen. It is essentially the British form of the word better known internationally as cyanosis, and both terms share the same clinical meaning. The colour change arises from an excess of deoxygenated haemoglobin in the small vessels near the skin surface, and it can signal serious underlying problems involving the heart, lungs, or circulation. Clinicians distinguish central forms, which affect the tongue and lips and point to heart or lung causes, from peripheral forms limited to the extremities, often due to poor circulation or cold exposure. Cyanose is a formal medical term rather than an everyday word, but it remains valuable shorthand for one of medicine's most visually striking warning signs.
nounA bluish discolouration of the skin and mucous membranes caused by deficient oxygenation of the blood; chiefly the British form of the term more commonly written as cyanosis in American medical usage.
- Bluish discolouration of the skin and mucous membranes resulting from inadequate oxygenation of the blood, seen in conditions affecting the heart, lungs, or circulation.
"The paramedics noted pronounced cyanose around the patient's lips, signalling dangerously low oxygen levels."
"The infant's cyanose of the fingertips prompted an immediate cardiac evaluation."
"In chronic lung disease, mild cyanose may persist even after treatment."
Rarely pluralised; the condition is usually discussed as a single clinical sign.
"Both peripheral and central cyanoses were documented in the examination notes."
The word traces back to Greek 'kyanos' — the same root that gave us cyanide and even the blue gemstone kyanite.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cyanose
Cyanose derives from the Greek word 'kyanos', meaning dark blue enamel or lapis-like blue, which also gives its name to the colour cyan. The term entered medical vocabulary through Latinised Greek forms during the development of modern clinical medicine, alongside its sibling term cyanosis. Other English words drawing on the same Greek root include cyanide, cyanic acid, and the mineral name kyanite.
Related word forms
How cyanose is actually used
Medical register; used almost exclusively by clinicians and in medical literature. The form 'cyanosis' is far more common internationally, so 'cyanose' should be used with awareness of its chiefly British currency.
Easily confused with cyanose
Cyanosis is the standard American and international term for oxygen-deficient blueness of the skin, while cyanose is the chiefly British spelling and usage of the same condition.