[ gwahy-yoo-suh, wahy- ]
/ gwaɪˈyu sə, waɪ- /


a tree, Ilex guayusa, native to the rainforest in the upper Amazon river basin.
the leaves of this tree, containing caffeine, theobromine, theophylline, and other compounds, prepared as a tea and used as a stimulant. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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