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]
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