1. (Bot.) A tree (Antiaris toxicaria) of the Breadfruit family, common
in the forests of Java and the neighboring islands. Its secretions are
poisonous, and it has been fabulously reported that the atmosphere
about it is deleterious. Called also bohun upas.
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2. A virulent poison used in Java and the adjacent islands for
poisoning arrows. One kind, upas antiar, is derived from the upas tree
(Antiaris toxicaria). Upas tieute is prepared from a climbing plant
(Strychnos Tieute).