/ Dictionary / Index G growth hormone releasing factor: Meaning and Definition of Find definitions for: growth' hor"mone releas'ing fac"tor Pronunciation: [key] — Biochem. Biochem. a substance produced in the hypothalamus that regulates the release of growth hormone by the anterior pituitary gland. Abbr.: GRF Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. growth hormone growth ring Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language