a. [f. L. cupre-us of copper (f. cupr-um copper) + -OUS.]

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  1.  Of copper; of the nature of copper; consisting of or containing copper.

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1666.  Boyle, Orig. Formes & Qual. A Cupreous Resin.

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1693.  Slare, in Phil. Trans., XVII. 900. Such Particles as are of a Cupreous Nature.

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1807.  T. Thomson, Chem. (ed. 3), II. 398. Boracic acid and cupreous salts tinge it green.

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1857.  Scoffern, Useful Metals, 530. Wicklow … has long been celebrated for its cupreous deposits.

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  2.  Resembling copper; copper-colored.

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1804.  Phil. Trans., XCIV. 316. It is most frequently of the colour of bronze, passing to a pale cupreous-red.

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1849.  Thoreau, Week Concord Riv., Saturday 32. This bright cupreous dolphin.

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