Noun
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.
A virulent poison used in Java and the adjacent islands for poisoning arrows. One kind, upas antiar, is, derived from upas tree (Antiaris toxicaria). Upas tieute is prepared from a climbing plant (Strychnos Tieute).
Source: Webster's dictionaryLook up! the proof is round you written large; Your Faith is in the balance wanting found; Your shipless seas confess it; bridgeless streams; Your wasted wealth of ore, and moor, and bay. Beneath the Upas shade of Faith depraved All things lie dead -- wealth, comfort, freedom, power. Aubrey Thomas de Vere