n.
Pronunciation: ' yü-p ə s
Function: noun
Etymology: Indonesian Malay pohon upas poison tree
Date: 1814
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