WordNet
abdominal external oblique muscle
n. a diagonally arranged abdominal muscle on either side of the torso [syn: external oblique muscle, musculus obliquus externus abdominis, oblique]
Wikipedia
Abdominal external oblique muscle
The external oblique muscle (of the abdomen) (also external abdominal oblique muscle) is the largest and the most superficial (outermost) of the three flat muscles of the lateral anterior abdomen.