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guayusa

[gwahy-yoo-suh, wahy-]
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noun
  1. a tree, Ilex guayusa, native to the rainforest in the upper Amazon river basin.
  2. the leaves of this tree, containing caffeine, theobromine, theophylline, and other compounds, prepared as a tea and used as a stimulant.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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