WordNet (r) 3.0 (2006):

adrenocorticotrophic hormone
    n 1: a hormone produced by the anterior pituitary gland that
         stimulates the adrenal cortex [syn: adrenocorticotropic
         hormone, adrenocorticotrophic hormone, ACTH,
         adrenocorticotropin, adrenocorticotrophin,
         corticotropin, corticotrophin]