from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A deciduous tree (Antiaris toxicaria) of tropical Africa and Asia that yields a latex used as an arrow poison.
- n. The poison obtained from this tree or from similar trees.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A tree Antiaris toxicaria of the breadfruit family, common in the forests of Java and the neighboring islands, with poisonous secretions.
- n. A virulent poison used in Java and the adjacent islands for poisoning arrows derived from the tree.
- n. A poison prepared from a climbing plant Strychnos tieute
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
- n. 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).
from The Century Dictionary and Cyclopedia
- n. The poisonous sap of different trees of the Malayan and Philippine Islands, more or less used for arrow-poison.
- n. The tree Antiaris toxicaria, one of the largest Javanese trees, having a cylindrical stem 60 or 70 feet high below the branches.
- n. Figuratively, something baneful or pernicious from a moral point of view: as, the upas of drunkenness.
Malay (pohun) upas, poison (tree), of Javanese origin.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Malay upas. (Wiktionary)