tragacanth

trag·a·canth

noun
\ˈtraj-ə-ˌkan(t)th, ˈtrag-, -kən(t)th; also ˈtrag-ə-ˌsan(t)th\

Definition of TRAGACANTH

: a gum obtained from various Asian or East European leguminous plants (genus Astragalus and especially A. gummifer) that swells in water and is used as an emulsifying, suspending, and thickening agent and as a demulcent—called also gum tragacanth, hog gum