/ Dictionary / Index H hypopituitarism: Meaning and Definition of Find definitions for: hy•po•pi•tu•i•ta•rism Pronunciation: (hī"pō-pi-t'i-tu-riz"um, -ty'-), [key] — n. Pathol. abnormally diminished activity of the pituitary gland, esp. of the anterior lobe. the condition produced by this, characterized by obesity, retention of adolescent traits, sterility, amenorrhea, and, in extreme cases, dwarfism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hypopiesis hypoplasia Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language