Definition of Achilles tendon

Achilles tendon: A tough sinew that attaches the
calf muscle to the back of the heel bone. The Achilles tendon is one of the longest tendons in the body. It is also called the tendo Achilles or the tendo calcaneus, the calcaneus being the heel bone.
According to Greek mythology, Achilles's mother held him as a
baby by the heel and dipped him in the river Styx to make him
invulnerable but the heel by which she held him remained unimmersed
and hence vulnerable, as Paris' arrow in Achilles' heel
later proved.

Definition of Achilles

Achilles: In Greek mythology, the hero who was thought to have some special medical knowledge. Achilles studied medicine with Chiron, the centaur, who invented it.
"...But save me. Take me to the ship, cut this arrow out of my leg, wash the blood from it with warm water and put the right things on it - the plants they say you have learned about from Achilles who learned them from Chiron, the best of the Centaurs." (The Iliad of Homer, Book XI).
See also Achilles tendon
.