vasopressin

va·so·pres·sin

noun \ˌvā-zō-ˈpres-^ən\

Definition of VASOPRESSIN

: a polypeptide hormone that is secreted together with oxytocin by the posterior lobe of the pituitary gland, is also obtained synthetically, and increases blood pressure and exerts an antidiuretic effect—called also antidiuretic hormone, beta-hypophamine; see arginine vasopressin, lysine vasopressin, pitressin