clonus
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
A rhythmic, involuntary series of muscle contractions provoked by sudden stretch, indicating upper motor neurone pathology.
Sustained ankle clonus of more than five beats confirmed the pyramidal tract involvement suggested by her spasticity.
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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