The Collaborative International Dictionary
Achilles' tendon
Achilles' tendon \A*chil"les' ten"don\, n. [L. Achillis tendo.] (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.
Wiktionary
achilles' tendon
n. (context chiefly US English) (alternative form of Achilles tendon English)
Usage examples of "achilles' tendon".
The bullet had missed the joint, but had neatly severed the Achilles' tendon just above the heel.