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From The Collaborative International Dictionary of English v.0.48:
Astragalus \As*trag"a*lus\, n. [L. See Astragal.] 1. (Anat.) The ankle bone, or hock bone; the bone of the tarsus which articulates with the tibia at the ankle. [1913 Webster] 2. (Bot.) A genus of papilionaceous plants, of the tribe Galege[ae], 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. [1913 Webster] 3. (Arch.) See Astragal, 1. [1913 Webster]