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A Virulent poison prepared in Java from the gum resin of one species of the upas tree (Antiaris toxicaria).

A poisonous principle obtained from antiar. Watts.

bearer (Zoöl.). See Basket worm, under Basket. -- Sack tree (Bot.), an East Indian tree (Antiaris saccidora) which is cut into lengths, and made into sacks by turning the bark inside out, and leaving a slice of the wood for a bottom. -- To give the sack to or get the sack, to discharge, or be discharged, from employm…

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.