urea
B2CEFR level
50/100Rarity: uncommon
TechnicalRegister
A nitrogenous waste product excreted by the kidneys whose blood level rises when renal function declines.
Both urea and creatinine were markedly raised, in keeping with significant renal impairment.
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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