Renal (adjective)

1. Related to the kidneys.
2. Of or pertaining to the renal system.

Origin:

From the latin renalis, from renes meaning "kidneys".

Examples:

1. The patient was diagnosed with renal failure.
2. The renal function test measures how well the kidneys are working.
3. The renal artery carries blood to the kidneys.
4. The renal vein carries blood away from the kidneys.
5. The renal pelvis is the funnel-like structure in the kidney that collects urine.