copperas.
Any of various metallic sulphates formed from the reaction of sulfur with iron, zinc, or copper, especially (alchemy) solutions of such compounds misunderstood as a mediator or catalyst for the transmutation of iron into copper &c.
Meaning & usage
Any of various metallic sulphates formed from the reaction of sulfur with iron, zinc, or copper, especially (alchemy) solutions of such compounds misunderstood as a mediator or catalyst for the transmutation of iron into copper &c.
Synonym of iron(II) sulfate.
Where this word comes from
From Middle English coperas, coperose (“any metallic sulfate”), from Medieval Latin cuprosa directly or via Old French coperose, from Medieval Latin aqua cuprosa (“cupreous water”), from Latin cuprum (“copper”) + -osa (“-ose: forming related adjectives”). Fanciful derivations from cupreous terms involving Latin rosa (“rose”) are mistaken.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.