Where does “copperas” come from?
Copperas derives from Middle English coperas, of uncertain ultimate origin and meaning.
copperas (English): iron sulfate
Ancestry of “copperas”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Middle English | coperas | A metallic sulfate |
| 2 | Middle English | coperose | metallic sulfate |