Ŭ'pas, n.

n. [Also bohun-upas.] [Malay. pāhn-ūpas, from pāhn, a tree, and ūpas, poison.] (Bot.) A tree of the genus Antiaris (A. toxicaria), common in the forests of Java and of the neighboring isles, the secretions of which are poisonous. It has been fabulously reported that the atmosphere surrounding it is deleterious.