1
: a tall tropical Asian tree (Antiaris toxicaria) of the mulberry family with a latex that contains poisonous glycosides used as an arrow poison
also : a poisonous concentrate of the juice or latex of a upas
2
: a poisonous or harmful influence or institution

Examples of upas in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The deadly upas, root and branch, leaf and fibre, body and sap, must be utterly destroyed. — Frederick Douglass, The Atlantic, 16 Aug. 2017

Word History

Etymology

Indonesian Malay pohon upas poison tree

First Known Use

1814, in the meaning defined at sense 1

Time Traveler
The first known use of upas was in 1814

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Cite this Entry

“Upas.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/upas. Accessed 30 Sep. 2026.

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