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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English vertegrece, verdegres, from Old French verte grez (literally “acidic green”), an alteration of older verte de Grece (literally “green of Greece”). The modern French writing of this word is vert-de-gris (literally “green of gray”).
cupric acetate
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Classic usage
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