单词	guarana
释义	guarana /ɡwəˈrɑːnə / noun 1 [mass noun] A substance prepared from the seeds of a Brazilian shrub, used as a tonic or stimulant.Plus, some herbal products billed as energy boosters or fat burners contain caffeine-rich herbs such as guarana or stimulants such as ephedra.... Energy-boosting drinks may contain Ma Huang or guarana; both act as a stimulant and may increase heart rate and blood pressure. These products, available in health food stores or on the Internet, contain stimulants such as ephedra, caffeine, and guarana, with variable additions of common herbs or vitamins. 2The shrub that yields guarana. Paullinia cupana, family Sapindaceae. Origin Mid 19th century: from Tupi.
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