COPPERAS


Meaning of COPPERAS in English

[cop.per.as] n [ME coperas, fr. OF couperose, fr. ML cuprosa, prob. fr. aqua cuprosa, lit., copper water, fr. LL cuprum] (14c): a green hydrated ferrous sulfate used esp. in making inks and pigments

Merriam-Webster English vocab.      Английский словарь Merriam Webster.