Nikolsky sign
C2CEFR level
98/100Rarity: very rare
TechnicalRegister
The shearing away of superficially normal-looking epidermis under lateral pressure, indicating intraepidermal loss of cohesion.
A positive Nikolsky sign at the bedside strongly supported a diagnosis of pemphigus vulgaris.
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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