Lewis & Short

trăgăcanthum, i, n. [tragacantha], gum-tragacanth, Cels. 4, 4, 3; 4, 5, 13; Scrib. Comp. 78; 108.
Called also, in a corrupted form, drăgantum, i, n., Veg. Vet. 1, 32; Theod. Prisc. de Diaeta, 9.