What does "quebracho" mean?

Quebracho: A Chilian apocynaceous tree (Aspidosperma Quebracho); also, its bark, which is used as a febrifuge, and for dyspnoea of the lung, or bronchial diseases; -- called also white quebracho, to distinguish it from the red quebracho, a Mexican anacardiaceous tree (Loxopterygium Lorentzii) whose bark is said to have similar properties. J. Smith (Dict. Econ. Plants).