trag·a·canth | \ ˈtra-jə-ˌkan(t)th 
, ˈtra-gə-, -kən(t)th ; also ˈtra-gə-ˌsan(t)th \
, ˈtra-gə-, -kən(t)th ; also ˈtra-gə-ˌsan(t)th \Definition of tragacanth
: a gum obtained from various Asian or eastern European plants (genus Astragalus and especially A. gummifer) of the legume family that swells in water and is used chiefly as an emulsifying, suspending, or thickening agent
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The first known use of tragacanth was in 1558
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