crust
A1CEFR level
10/100Rarity: common
TechnicalRegister
A hardened deposit formed when serum, blood, or purulent exudate dries on the skin surface.
The impetiginised lesions were covered by a characteristic honey-coloured crust.
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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