Etymology
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adrenal (adj.)

"of or near the kidneys," 1866, Modern Latin, from ad- + renalis "of the kidneys," from Latin renes "kidneys" (see renal). Adrenal gland is from 1875.

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Definitions of adrenal
1
adrenal (adj.)
of or pertaining to the adrenal glands or their secretions;
adrenal (adj.)
near the kidneys;
2
adrenal (n.)
either of a pair of complex endocrine glands situated near the kidney;
Synonyms: adrenal gland / suprarenal gland
From wordnet.princeton.edu