/ Dictionary / Index F fog signal: Meaning and Definition of Find definitions for: fog' sig"nal Pronunciation: [key] any of various types of signal used as a warning by vessels navigating in fog or mist. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fogsignal (Thesaurus) fogram fogy Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language