/ Dictionary / Index R releasing factor: Meaning and Definition of Find definitions for: releas'ing fac"tor Pronunciation: [key] — Biochem. Biochem. a substance usually of hypothalamic origin that triggers the release of a particular hormone from an endocrine gland. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. release therapy releasing mechanism Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language