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Webster 1913 Edition

Copperas

Cop′per-as

,
Noun.
[OE.
coperose
, F.
couperose
, fr. (assumed?) L.
cuprirosa
, equiv. to G.
χάλκανθος
, 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
.
☞ The term copperas was formerly synonymous with vitriol, and included the green, blue, and white vitriols, or the sulphates of iron, copper, and zinc.

Webster 1828 Edition

Copperas

COPPERAS

,
Noun.
Sulphate of iron, or green vitriol; a salt of a peculiar astringent taste, and of various colors, green, gray, yellowish, or whitish, but more usually green. It is much used in dyeing black and in making ink, and in medicine, as a tonic. The copperas of commerce is usually made by the decomposition of iron pyrites. The term copperas was formerly synonymous with vitriol, and included the green, blue and white vitriols, or the sulphates of iron, copper and zink.

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