from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A hydrous copper arseniate of an emerald-green colour.
from the GNU version of the Collaborative International Dictionary of English
- n. A hydrous arseniate of copper, of an emerald-green color; -- so called from Erin, or Ireland, where it occurs.
from The Century Dictionary and Cyclopedia
- n. A basic copper arsenate occurring in green mammillary crystalline forms: from Cornwall, but earlier supposed to come from Ireland, hence the name.
Erin + -ite, referring to Ireland, where it occurs. (Wiktionary)