/ Dictionary / Index N nautophone: Meaning and Definition of Find definitions for: nau•to•phone Pronunciation: (nô'tu-fōn", not'u-), [key] — n. Naut. an electrically operated horn for giving fog warnings. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nautilus nav. 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