/ Dictionary / Index D double-u: Meaning and Definition of Find definitions for: dou•ble-u Pronunciation: (dub'ul y"), [key] — n. the letter w. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: double-u (Thesaurus) double truck double vision Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language