GNU Collaborative International Dictionary of English
Found one definition
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Renal (rēˈnal), a. [L. renalis, fr. renes the kidneys or reins: cf. F. rénal. See Reins.] (Anat.) Of or pertaining to the kidneys; in the region of the kidneys.
[1913 Webster]
Renal capsules or Renal glands, the suprarenal capsules. See under Capsule. -- Renal casts, Renal colic. (Med.) See under Cast, and Colic.
[1913 Webster]