The Collaborative International Dictionary of English v.0.48:

Adrenal \Ad*re"nal\, a. [Pref. ad- + renal.] (Anat.)
   Suprarenal.
   [1913 Webster]

WordNet (r) 3.0 (2006):

adrenal
    adj 1: of or pertaining to the adrenal glands or their
           secretions
    2: near the kidneys
    n 1: either of a pair of complex endocrine glands situated near
         the kidney [syn: adrenal gland, adrenal, suprarenal
         gland]