/ Thesaurus / A Synonyms of abo blood group system Find synonyms for: Noun1. ABO blood group system, ABO system, ABO group, classification systemusage: a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and OWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language