Definition of 'ab'
- a bachelor's degree in arts and sciences
Synonyms: Bachelor of Arts BA Artium Baccalaurens
- the eleventh month of the civil year; the fifth month of the ecclesiastical year in the Jewish calendar (in July and August)
- the muscles of the abdomen
Synonyms: abdominal abdominal muscle
- the blood group whose red cells carry both the A and B antigens
Synonyms: type AB group AB