diastasis
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
Abnormal separation of two normally adjacent bones or of the parts of a single bone.
Diastasis of the distal tibiofibular joint widened the ankle mortise on the weight-bearing film.
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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