cyanosis
C2CEFR level
82/100Rarity: very rare
TechnicalRegister
A bluish discolouration of the skin or lips caused by inadequate oxygen in the blood.
Central cyanosis was visible around the lips on inspection.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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