UPAS
\jˈuːpəz], \jˈuːpəz], \j_ˈuː_p_ə_z]\
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A virulent poison used in Java and the adjacent islands for poisoning arrows. One kind, upas antiar, is, derived from upas tree (Antiaris toxicaria). tieute is prepared from a climbing plant (Strychnos Tieute).
By Noah Webster.