Que*bec" group`(?). (Geol.) The middle of the three groups into which the rocks of the Canadian period have been divided in the American Lower Silurian system. See the Chart of Geology.
Que*bra"cho(?), n. [Sp.] (Bot.) A Chilian apocynaceous tree (Aspidosperma Quebracho); also, its bark, which is used as a febrifuge, and for dyspna 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).
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