fistula
C2CEFR level
85/100Rarity: very rare
TechnicalRegister
An abnormal channel connecting a source of infection to a surface, through which pus may drain.
A sinus tract, sometimes termed a fistula, drained the chronic periapical abscess onto the gingiva.
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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