- copperasAny 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.
- cupricOf, pertaining to, or derived from, copper; containing copper.
- cupriferousContaining or producing copper.
- cuprineSynonym of cupric (“pertaining to or derived from copper”).
- cuprousOf, or of the nature of, copper.