kidney stone
B1CEFR level
30/100Rarity: fairly common
TechnicalRegister
A hard mineral deposit that forms within the kidney and can pass into the urinary tract.
The CT showed a five-millimetre kidney stone lodged at the vesicoureteric junction.
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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