upas noun3 •A tree, Antiaris toxicaria, of the mulberry family, common in the forests of Java and the neighboring islands, with poisonous secretions.[I]t is an all-blasting upas, whose root is earth, and whose leaves are the skies which rain their poison-dews upon mankind. — 1818 •A virulent poison used in Java and the adjacent islands for poisoning arrows and derived from the tree. •A poison prepared from the climbing plant Strychnos tieute. formsupases
