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qua·dra·tus kwä-'drāt-əs n, pl qua·dra·ti -.ī any of several skeletal muscles more or less quadrilateral in outline see PRONATOR QUADRATUS
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n.
any of various four-sided muscles. The quadratus femoris is a flat muscle at the head of the femur, responsible for lateral rotation of the thigh.
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quad·ra·tus (kwod-raґtəs) [L.] squared; four sided.Medical dictionary. 2011.