/ Dictionary / Index I inhibin: Meaning and Definition of Find definitions for: in•hib•in Pronunciation: (in-hib'in), [key] — Biochem. Biochem. a hormone, found in semen, that acts on the pituitary gland to decrease FSH. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. in. Hg inhibit Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language