/ Thesaurus / O Synonyms of old prussian Find synonyms for: Noun1. Old Prussian, Baltic, Baltic languageusage: a dead language of the (non-German) Prussians (extinct after 1700); thought to belong to the Baltic branch of Indo-EuropeanWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language