The Collaborative International Dictionary of English v.0.48:

Suprarenal \Su`pra*re"nal\, a. (Anat.)
   Situated above, or anterior to, the kidneys. -- n. A
   suprarenal capsule.
   [1913 Webster]

   Suprarenal capsules (Anat.), two small bodies of unknown
      function in front of, or near, the kidneys in most
      vertebrates. Also called renal capsules, and suprarenal
      bodies.
      [1913 Webster] Suprascalpular