/ Dictionary / Index T tidal flat: Meaning and Definition of Find definitions for: tid'al flat" Pronunciation: [key] tideland that is flat or nearly flat and often muddy or marshy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tidal datum tidal light Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language