/ Thesaurus / R Synonyms of rosin bag Find synonyms for: Noun1. rosin bag, bag, baseball equipmentusage: a bag filled with rosin; used by baseball pitchers to improve their grip on the ballWordNet 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