ab in English
- Ab⇄Ab(no period),
(Chemistry.) alabamine (the name originally used for ?astatine). - AB⇄AB(no periods),
one of the four major blood factors or groups widely used to determine blood compatibility in transfusions. A person with AB type blood can receive blood of either the AB, A, B, or O group. - Ab⇄Ab, noun.
the eleventh (or, in leap year, the twelfth) month of the Jewish civil year, and the fifth month of the ecclesiastical year, beginning in July or in the first part of August.