keratoacanthoma
C2CEFR level
98/100Rarity: very rare
TechnicalRegister
A rapidly growing, crateriform skin tumour with a central keratin plug that may involute spontaneously.
A keratoacanthoma on the dorsum of the hand had enlarged over just six weeks.
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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