/ Dictionary / Index A ANF: Meaning and Definition of Find definitions for: ANF Pronunciation: [key] atrial natriuretic factor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. anew Anfinsen Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language