que·bra·cho 
(kā-brächō)
(kā-brächō)n. pl. que·bra·chos
1. Either of two South American trees, Aspidosperma quebracho-blanco whose bark is used in medicine, or Schinopsis lorentzii whose wood is an important source of tannin.
2. The bark or wood of either of these trees.
[Spanish, alteration of quiebrahacha : quebrar, to break (from Latin crepāre, to crack) + hacha, axe (from French hache, from Old French, of Germanic origin).]