Breadcrumb Home > Thesaurus > O Synonyms of opsonin Find synonyms for: Noun 1. opsonin, antibody usage: an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of opsonin (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: rort Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language