/ Dictionary / Index D doubletree: Meaning and Definition of Find definitions for: dou•ble•tree Pronunciation: (dub'ul-trē"), [key] — n. a pivoted bar with a whiffletree attached to each end, used in harnessing two horses abreast. See illus. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: doubletree (Thesaurus) double-trailer truck double truck Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language