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il·io·coc·cy·geus | \ ˌil-ē-ō-käk-ˈsij-(ē-)əs 
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\Medical Definition of iliococcygeus
: a muscle of the pelvis that is a subdivision of the levator ani, has its origin at the pubic symphysis and the tendon which arches over the obturator internus, inserts on the coccyx and perineal body, and helps support the pelvic viscera — compare pubococcygeus
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