Copperas

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Iron(II) sulfate. uncountable, usually

    "It were superfluous to describe the Process of making the Aqua fortis; it shall suffice to let you know, that our common Coperas makes this Aquafortis well enough for our purpose[…]"

  2. 2
    An obsolete sulphate compound with one of the three metals, zinc, copper or iron. uncountable, usually

Synonyms

All synonyms
alcoholchemicalferrous sulfateferrous sulfategreen vitriolgreen vitriol

Example

More examples

"It were superfluous to describe the Process of making the Aqua fortis; it shall suffice to let you know, that our common Coperas makes this Aquafortis well enough for our purpose[…]"

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".

Related phrases

blue copperasgreen copperaswhite copperasyellow copperasiron ii sulfate

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.