- The ankle bone, or hock bone; the bone of the tarsus
which articulates with the tibia at the ankle. - A genus of papilionaceous plants, of the tribe
Galegeae, 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 A. gummifer and A. verus. - See Astragal, 1.