/ Thesaurus / S Synonyms of serratus posterior superior Find synonyms for: Noun1. serratus posterior superior, posterior serratus muscle, serratus posterior, musculus serratus posteriorusage: a thin quadrilateral muscle of the upper and dorsal part of the thorax; acts to elevate the upper ribsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: leonine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language