Achilles tendon:One of the longest tendonsinthe body, a tough sinew that attaches thecalfmuscleto the back of theheel bone(calcaneus). The name comes from Greek mythology: The hero Achilles was invulnerable toinjuryexcept forhisheel, which proved his downfall when it was pierced by Paris's arrow. It has also proved, literally, to be the downfall of many athletes who have experienced the sudden pain of itsrupture.
