a. Obs. [Attrib. use of an early form of COPPERAS, app. treated like an adj. in -OSE = COPPEROUS a. 2.] Of or belonging to copperas or vitriol.
1646. Sir T. Browne, Pseud. Ep., VI. xii. 336. An Atramentous condition or mixture, that is a vitriolate or copperose quality.
1698. Cay, in Phil. Trans., XX. 370. It … has in some Places a Copperose Taste pretty strong.
