/ Dictionary / Index F FIDO: Meaning and Definition of Find definitions for: FIDO Pronunciation: (fī'dō), [key] — n. Aeron. a system for evaporating the fog above airfield runways by the heat from burners. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fidgety fiducial Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language