/ Dictionary / Index F Fathometer: Meaning and Definition of Find definitions for: Fa•thom•e•ter Pronunciation: (fa-om'i-tur), [key] — Trademark. Trademark. a brand of sonic depth finder. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fathometer (Thesaurus) fathom fathomless Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language