Noun ab has 4 senses
  1. AB, type AB, group AB - the blood group whose red cells carry both the A and B antigens
    --1 is a kind of blood group, blood type
  2. Bachelor of Arts, BA, Artium Baccalaurens, AB - a bachelor's degree in arts and sciences
    --2 is a kind of bachelor's degree, baccalaureate
  3. Ab, Av - the eleventh month of the civil year; the fifth month of the ecclesiastical year in the Jewish calendar (in July and August)
    --3 is a kind of Jewish calendar month
    --3 is a part of Jewish calendar, Hebrew calendar
  4. abdominal, abdominal muscle, ab - the muscles of the abdomen
    --4 is a kind of skeletal muscle, striated muscle
    --4 is a part of abdomen, venter, stomach, belly
    --4 has particulars:
     external oblique muscle, musculus obliquus externus abdominis, abdominal external oblique muscle, oblique; transversus abdominis muscle, transverse muscle of abdomen, musculus transversalis abdominis, transversus abdominis
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