/ Dictionary / Index O open sandwich: Meaning and Definition of Find definitions for: o'pen sand'wich Pronunciation: [key] a sandwich served on only one slice of bread, without a covering slice. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open registry open sea Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language