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plan·tar·is plan-'tar-əs n, pl plan·tar·es -.ēz a small muscle of the calf of the leg that arises from the lower end of the femur and the posterior ligament of the knee joint, is inserted with the Achilles tendon by a very long slender tendon into the calcaneus, and weakly flexes the leg at the knee and the foot at the ankle see PLANTAR INTEROSSEUS, VERRUCA PLANTARIS
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plan·ta·ris (plan-taґris) [L., from planta sole of the foot] [TA] plantar; a term designating relationship to the sole of the foot.Medical dictionary. 2011.