talus

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The bone of the ankle that articulates with the tibia and fibula to form the ankle joint. Also called anklebone, astragalus.
2. n. The ankle.
3. n. A sloping mass of rock debris at the base of a cliff.

Century Dictionary and Cyclopedia

1. n. In anat: The ankle or ankle-joint: as, os tali, the bone of the ankle.
2. n. The ankle-bone or huckle-bone; the astragalus.
3. n. In ornithology, same as calcaneum, 2.
4. n. That variety of clubfoot in which the heel rests on the ground and the toes are drawn up; talipes calcaneus.
5. n. In entomology, the apex or distal end of the tibia, articulated with the tarsus.
6. n. In architecture, the slope or inclination of any work, as of a wall inclined on its face, either by decreasing its thickness toward the summit or by leaning it against a bank.
7. n. In fort, the slope of a work, as a bastion, rampart, or parapet.
8. n. The mass of rocky fragments which lies at the base of a cliff or precipitous rock, and which has been formed by the accumulation of pieces brought down from above by the action of gravity, rain, frost, etc.; scree; debris; wash. See these words.

Wiktionary

1. n. anatomy The bone of the ankle.
2. n. geology A sloping heap of fragments of rock lying at the foot of a precipice.
3. n. architecture The slope of an embankment wall, which is thicker at the bottom than at the top.

GNU Webster's 1913

1. n. (Anat.) The astragalus.
2. n. (Surg.) A variety of clubfoot (Talipes calcaneus). See the Note under Talipes.
3. n. (Fort.) A slope; the inclination of the face of a work.
4. n. (Geol.) A sloping heap of fragments of rock lying at the foot of a precipice.

WordNet 3.0

1. n. a sloping mass of loose rocks at the base of a cliff
2. n. the bone in the ankle that articulates with the leg bones to form the ankle joint