/ Dictionary / Index O Old Prussian: Meaning and Definition of Find definitions for: Old' Prus'sian Pronunciation: [key] a Baltic language extinct since the 17th century. Abbr.: OPruss Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Old Provençal Old Ritualist Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language