cholesteatoma
C2CEFR level
96/100Rarity: very rare
TechnicalRegister
An expanding, destructive collection of keratinising squamous epithelium within the middle ear or mastoid.
The cholesteatoma had eroded the ossicular chain, accounting for the conductive hearing loss.
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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