/ Thesaurus / M Synonyms of mononuclear phagocyte system Find synonyms for: Noun1. mononuclear phagocyte system, MPS, system of macrophages, systemusage: a widely distributed system of free and fixed macrophages derived from bone marrowWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language