abo group abody • abohm · · · Info · Definitions · Characters · · abo group · · Text Common · · Latin · · Scripts 9 · · Length 3 · · Syllables Definitions · · · (noun) a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O. Synonyms: ABO blood group system, ABO system, ABO group. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 g latin small letter g U+0067 o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 u latin small letter u U+0075