/ Dictionary / Index N nerve growth factor: Meaning and Definition of Find definitions for: nerve' growth" fac"tor Pronunciation: [key] — Biochem. Biochem. a protein that promotes the growth, organization, and maintenance of sympathetic and some sensory nerve cells. Abbr.: NGF Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nerve gas nerve impulse Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language