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WordNet 3.0Copyright Princeton University
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n. - A large evergreen tree that was once thought to be poisonous.

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Usage examples (31)
  • (presented to the Royal Society), upon the effects of similar experiments made with what he terms the upas antiar.
  • The word 'upas,' in the language of the natives, means poison, and there is in the island a valley called the upas, or poison, valley.
  • The laburnum, with its golden rain, is potentially a kind of upas tree.
  • 'upas' tree -- sulphurous fumes attend final stages.
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Tutoring comment
  • This word was used in the 2006 Scripps National Spelling Bee finals.
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