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Copperas

noun

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

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".

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