Chem. [mod. f. prec. + -IN.] The poisonous principle of the Upas tree.
1863. Watts, Dict. Chem., I. 310. Antiarin … is employed by the Javanese for poisoning their arrows.
1866. Masters, in Treas. Bot., 74. The Upas-tree, when pierced, exudes a milky juice, which contains an acrid virulent poison, called Antiarin.
