[ 'kɒp(ə)rəs ]
■ noun green crystals of hydrated ferrous sulphate, especially as an industrial product.
Origin
ME coperose , from OFr. couperose , from med. L. cuperosa , lit. 'flower of copper', from late L. cuprum (see copper 1 ) + rosa 'rose', translating Gk khalkanthon .