Definition of upas
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
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Merriam-Webster unabridged
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Time Traveler for upas
The first known use of upas was in 1814
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