achillo-, achill-, Achilles

(Greek > Latin: tendon at the back of the heel)

The Trojan hero and son of Thetis and Peleus from a Greek myth.
Achilles heel (s) (noun) (no plural)
A weakness that seems small but makes someone fatally vulnerable even when he or she is in an otherwise strong physical condition.
Etymology: Named about Achilles, a hero in the Greek mythology. When Achilles was a baby, his mother Thetis dipped him into the magical river Styx to make him invincible or unconquerable. She held him by the heel which remained untouched by the water and so it became his weak point. He was killed when the Trojan prince Paris shot an arrow that pierced his one vulnerable spot which was his heel.

In addition to Achilles, the tendon in the lower back of the ankle is now also known as the Achilles tendon.

—Dr. Ernest Klein, A Comprehensive Etymological Dictionary of the English Language, page 15.

The term Achilles heel was first used by a Dutch anatomist, Verheyden, in 1693 when he dissected his own amputated leg.

Achilles jerk
A reflex action of the foot that jerks downward when the lower leg muscles contract.
Achilles tendon (s) (noun), Achilles tendons (pl)
The tendon that connects the heelbone to the calf muscles: "Bruce had both his left and right Achilles tendons inflamed from excessive training for the long distance foot races."
achillobursitis (s) (noun), achillobursitides (pl)
Inflammation and thickening of the saclike cavities that are filled with fluid in the Achilles tendons; especially in front of them.
Pain in the Achilles tendon or in its bursa; achillobursitis.

The Achilles tendon is one of the better known anatomic features in sports medicine because of the abrupt nature of some abrupt injuries to this tendon. It is in the back of the lower leg and connects the calf muscle (the triceps surae) with the calcaneus bone in the heel.

This tendon is so named for the hero whose heel, according to Greek mythology, was the only part of his body where he was unprotected from harm.

A reflexogram of the Achilles tendon reflex.
Suture (joint in which the opposed surfaces are closely united or material used in closing a surgical wound with stitches) of the Achilles tendon.
achillotenotomy, achillotomy (s) (noun), achillotenotomies, achillotomies (pl)
Achilles color image of baby Surgical division of the Achilles tendon or one of the longest tendons in the body, (formally called the tendo achilles or the tendo calcaneus) is a tough sinew that attaches the calf muscle to the back of the heel bone (the calcaneus).

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.

See Achilles' Heel, the Myth for more details.

plastic achilles
A plastic surgery procedure to elongate the Achilles tendon.