Astragalus

from The Century Dictionary.

• noun In anatomy, the tibiale, or innermost one of the proximal row of tarsal bones.
• noun [capitalized] [NL.] A very large genus of plants, natural order Leguminosæ, mostly low herbs, found in all parts of the world except Australia and South Africa.
• noun plural The small carpal and tarsal bones of animals, used by the ancients in games of chance. Different sides had different numbers and different names. There were many artificial astragali, some of which were decorated.

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

• noun (Anat.) The ankle bone, or hock bone; the bone of the tarsus which articulates with the tibia at the ankle.
• noun (Bot.) A genus of papilionaceous plants, of the tribe Galegeæ, containing numerous species, two of which are called, in English, milk vetch and licorice vetch. Gum tragacanth is obtained from different oriental species, particularly the Astragalus gummifer and Astragalus verus.
• noun (Arch.) See Astragal, 1.

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

• proper noun A taxonomic genus within the family Fabaceae — the milk-vetches.

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

• noun large genus of annual or perennial herbs or shrubs of north temperate regions; largest genus in the family Leguminosae
• noun the bone in the ankle that articulates with the leg bones to form the ankle joint