Breadcrumb Home > Thesaurus > M Synonyms of mastoiditis Find synonyms for: Noun1. mastoiditis, inflammation, redness, ruborusage: inflammation of the mastoidWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of mastoiditis (Dictionary) ✖ Related Content Daily Word Quiz: shanghai Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language