名詞 a.b.:

1. a bachelor's degree in arts and sciences
   同義詞：Bachelor of Arts, BA, Artium Baccalaurens, AB
2. the eleventh month of the civil year; the fifth month of the ecclesiastical year in the Jewish calendar (in July and August)
   同義詞：Ab, Av
3. the muscles of the abdomen
   同義詞：abdominal, abdominal muscle, ab
4. the blood group whose red cells carry both the A and B antigens
   同義詞：AB, type AB, group AB