Pituitary Gland: definition Posted by: Cleo Libonati, RN, BSN in DICTIONARY 0 2,279 Views An exocrine gland located in the brain that regulates the activity of other glands by releasing 10 different stimulating hormones into the bloodstream. The pituitary is controlled by the hypothalamus. Glossary. 2013-09-07 Cleo Libonati, RN, BSN