Achilles tendon

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The large tendon connecting the heel bone to the calf muscle of the leg.

from the GNU version of the Collaborative International Dictionary of English.

• noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun anatomy 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a large tendon that runs from the heel to the calf