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Bible Dictionaries
Copperas

Webster's Dictionary

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(n.) 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.

Bibliography Information
Webster, Noah. Entry for 'Copperas'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​c/copperas.html. 1828.
 
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