hy·per·pi·tu·i·ta·rism 
(hī′pər-pĭ-tĭ-tə-rĭz′əm, -ty-)
(hī′pər-pĭ-tĭ-tə-rĭz′əm, -ty-)n.
1. Pathologically excessive production of anterior pituitary hormones, especially growth hormones.
2. The condition resulting from an excess of pituitary hormones, characterized by gigantism in children and acromegaly in adults.
hy′per·pi·tui·tar′y (-tĕr′ē) adj.