achilles : Idioms & Phrases
achilles tendon
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noun a large tendon that runs from the heel to the calf
Achilles tendon.
WordNet
achilles' heel
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noun a seemingly small but actual mortal weakness
WordNet
achilles' tendon
A*chil"les' ten"don noun
Etymology
L.Definitions
(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.
Webster 1913
tendon of achilles
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noun a large tendon that runs from the heel to the calf
Achilles tendon.