quebracho

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que·bra·cho

(kē-brah'chō),
The dried bark of a genus of trees, Aspidosperma quebrachoblanco; white quebracho (family Apocynaceae); has been used as a respiratory stimulant in emphysema, dyspnea, and chronic bronchitis; the two chief alkaloids are aspidospermine and quebrachine.
[Port. quebrahacho, fr. quebrar, to break, + hacha, axe, referring to the hardness of the wood]
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