Usage Note
Rénal is the medical adjective corresponding to rein (kidney). It appears in terms like insuffisance rénale (kidney failure) and calcul rénal (kidney stone). The feminine form is rénale, and the plural forms are rénaux / rénales. It is strictly a formal medical register term; everyday speech prefers du rein.
Examples
"Il souffre d'une insuffisance rénale chronique."
Natural Translation
He suffers from chronic kidney failure.
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