/ Dictionary / Index O open trailer: Meaning and Definition of Find definitions for: o'pen trail'er Pronunciation: [key] any dog that barks or bays on the trail of its quarry. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open-timbered open union Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language