sequestrum
C2CEFR level
97/100Rarity: very rare
TechnicalRegister
A fragment of dead bone that has become separated from healthy bone, characteristic of chronic osteomyelitis.
Surgical debridement removed the avascular sequestrum harbouring the persistent infection.
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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