copperas

- See Also:
- - coping stone
  - copious
  - copita
  - coplanar
  - copolymer
  - copper
  - copper beech
  - copper pyrites
  - copper sulphate
  - copper-bottomed
  - copperas
  - copperhead
  - copperplate
  - coppersmith
  - coppice
  - copra
  - copro-
  - coprocessor
  - coprolalia
  - coprolite
  - coprophagy
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Concise Oxford English Dictionary © 2008 Oxford University Press:
copperas /ˈkɒp(ə)rəs/

▶noun green crystals of hydrated ferrous sulphate, especially as an industrial product.

– origin ME coperose, from OFr. couperose, from med. L. cuperosa, lit. ‘flower of copper’, from late L. cuprum (see copper1) + rosa ‘rose’, translating Gk khalkanthon.

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copperas