abo blood group system
 

* 1.a classification system for the antigens of human blood used in blood transfusion therapy four groups are A and B and AB and O

English Related Words* 12-tone system

* a group of

* abelian group

* abo antibodies

* abo blood groups

* abo group

* abo system

* aboard

* aboard a ship

* aboard,all

* aboard,to fall

* abocclusion

* abodance

* abode

* abode of demons