You searched for: “achilles heel
Achilles heel (s) (noun) (no pl)
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.

This entry is located in the following unit: achillo-, achill-, Achilles (page 1)
A unit related to: “achilles heel
(a myth which has become a physical-medical application)
Word Entries at Get Words: “achilles heel
Achilles' Heel, the Myth
A myth which has become a physical-medical application unit.