A·chil·les' ten·don n. Anat. The strong tendon formed of the united tendons of the large muscles in the calf of the leg, an inserted into the bone of the heel; -- so called from the mythological account of Achilles being held by the heel when dipped in the River Styx.
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Achilles tendon
n : a large tendon that runs from the heel to the calf [syn: tendon
of Achilles]