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usually uncountable, plural upases
(usually countable) A tree, Antiaris toxicaria, of the mulberry family, common in the forests of Java and the neighboring islands, with poisonous secretions. quotations examples
[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, Thomas Love Peacock, chapter 11, in Nightmare Abbey, Hookham, published 1818
(uncountable) A virulent poison used in Java and the adjacent islands for poisoning arrows derived from the tree. examples
(uncountable) A poison prepared from the climbing plant Strychnos tieute. examples