The Collaborative International Dictionary of English v.0.48:

corticosterone \corticosterone\ n.
   any of several steroid compounds secreted by the adrenal
   cortex; they are involved in regulating water and electrolyte
   balance in the body.
   [WordNet 1.5] corticotrophin

WordNet (r) 3.0 (2006):

corticosterone
    n 1: secreted by the adrenal cortex; involved in regulating
         water and electrolyte balance in the body