guarana

[gwahr-uh-nah, gwahr-uh-nah]
noun
1.
a woody, climbing shrub Paullinia cupana, of the soapberry family, growing in parts of South America, having seeds that contain caffeine and are used in soft drinks.
2.
a drink containing extract of guarana seed.

Origin:
1860–65; (< Portuguese) < Tupi

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

guarana

(Paullinia cupana), woody, climbing plant, of the soapberry family (Sapindaceae), native to the Amazon Basin. It has a smooth, erect stem; large leaves with five oblong-oval leaflets; clusters of short-stalked flowers; and fruit about the size of a grape and usually containing one seed shaped like a tiny horse chestnut.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Guarana, in particular, can substantially increase the total caffeine in an energy drink.
Allow me to translate: the caffeine, guarana and taurine make it so that you're less aware you're drunk, so you get more drunk.
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