[key-brah-choh; Spanish ke-vrah-chaw]
noun, plural quebrachos [key-brah-chohz; Spanish ke-vrah-chaws] .
any of several tropical American trees of the genus Schinopsis, having very hard wood, especially S. lorentzii, the wood and bark of which are important in tanning and dyeing.
a tree, Aspidosperma quebrachoblanco, of the dogbane family, yielding a medicinal bark.
the wood or bark of any of these trees.

1880–85; < American Spanish, variant of quiebracha, quiebra-hacha literally, (it) breaks (the) hatchet; see quebrada, hatchet

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World English Dictionary
quebracho (keɪˈbrɑːtʃəʊ, Spanish keˈβratʃo)
n , pl -chos
1.  either of two anacardiaceous South American trees, Schinopsis lorentzii or S. balansae, having a tannin-rich hard wood used in tanning and dyeing
2.  an apocynaceous South American tree, Aspidosperma quebrachoblanco, whose bark yields alkaloids used in medicine and tanning
3.  the wood or bark of any of these trees
4.  any of various other South American trees having hard wood
[C19: from American Spanish, from quiebracha, from quebrar to break (from Latin crepāre to rattle) + hacha axe (from French hache)]

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