copperas

== English == === Alternative forms === coperas === Etymology === From Middle English coperas, coperose (“metallic sulfate”), from Old French coperose. Compare French couperose (“sulfate”), Medieval Latin cuprosa, Late Latin aqua cuprosa, Latin cupri rosa, "rose of copper". === Noun === copperas (usually uncountable, plural copperases) Iron(II) sulfate. Synonym: vitriol An obsolete sulphate compound with one of the three metals, zinc, copper or iron. ==== Derived terms ==== ==== Translations ==== === Further reading === copperas on merriam-webster.com David Barthelmy (1997–2026), “Copperas”, in Webmineral Mineralogy Database. “copperas”, in Mindat.org, Keswick, Va.: Hudson Institute of Mineralogy, 2000–2026. copperas on Wikipedia.Wikipedia