gum tragacanth
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trag•a•canth
(ˈtræg əˌkænθ, ˈtrædʒ-)n.
a gum of various Asian shrubs belonging to the genus Astragalus, of the legume family, used as a filler, as in pills, and to stiffen calico.
[1565–75; < Latin tragacantha goat's thorn < Greek tragákantha=trág(os) goat + ákantha thorn]
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