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Meaning of upas

u•pas

Pronunciation: (y'pus), [key]
— n.
  1. the poisonous milky sap of a large tree, Antiaris toxicaria, of the mulberry family, native to tropical Asia, Africa, and the Philippine Islands, used for arrow poison.
  2. the tree itself.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.