What does "renal" mean?

Renal: Of or pertaining to the kidneys; in the region of the kidneys. Renal calculus (Med.), a concretion formed in the excretory passages of the kidney. -- Renal capsules or glands, the suprarenal capsules. See under Capsule. -- Renal casts, Renal colic. (Med.) See under Cast, and Colic.

Sources