copperas

• POS: Noun
• HYPHEN: cop=per=as

CIDE DICTIONARY

copperas, n. [OE. coperose, F. couperose, fr. (assumed?) L. cuprirosa, equiv. to G. cha`lkanqos, i. e. copper flower, vitriol. See Copper and Rose.].

 Green vitriol, or sulphate of iron; a green crystalline substance, of an astringent taste, used in making ink, in dyeing black, as a tonic in medicine, etc. It is made on a large scale by the oxidation of iron pyrites. Called also ferrous sulphate.  [1913 Webster]
" The term copperas was formerly synonymous with vitriol, and included the green, blue, and white vitriols, or the sulphates of iron, copper, and zinc."  [1913 Webster]

OXFORD DICTIONARY

copperas, n. green iron-sulphate crystals.

Etymology

ME coperose f. OF couperose f. med.L cup(e)rosa: perh. orig. aqua cuprosa copper water

ROGET THESAURUS

copperas

Greenness

N greenness, green, blue and yellow, vert, emerald, verd antique, verdigris, malachite, beryl, aquamarine, absinthe, cr=eme de menthe, terre verte, verditer, verdine, copperas, greenness, verdure, viridity, viridescence, verditure, glaucoma, rokunaisho, green, verdant, glaucous, olive, olive green, green as grass, verdurous, emerald green, pea green, grass green, apple green, sea green, olive green, bottle green, coke bottle green, greenish, virent, virescent, green (learner), new, inexperienced, novice, (unskillful), green (ill, sick), green with envy, the green grass of Ireland, the wearing of the green.