tragacanth
trag.a.canth \'traj-*-.kan(t)th, 'trag-, -k*n(t)th; 'trag-*-.san(t)th\ n [MF tragacanthe, fr. L tragacantha, fr. Gk tragakantha, fr. (Xtragos goat + akantha thorn - more at ACANTH- : a gum obtained from various Asiatic or East European leguminous plants ( genus Astragalus, esp. A. gummifer) that swells in water and is used in the arts and in pharmacy; also : a plant yielding this