/ Dictionary / Index N NGF: Meaning and Definition of Find definitions for: NGF Pronunciation: [key] nerve growth factor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ngf (Thesaurus) NGC NGk Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language