PCelt. *omiyo- ‘copper, bronze’ < PIE. *HoHmo- 'raw'. "We may assume that the meaning 'copper' is earlier... A derivation of *omiyo- from *omo- 'raw' appears formally possible, but the semantic connection is weak. Was 'copper' conceived of as 'raw metal' in contrast to iron, which is melted at much higher temperatures?" (RM). Ranko Matasović. "omiyo-" in: Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill, 2014. Brill Online. November 25, 2014. < http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/lemma.html?id=17013 >
Robert Farren, PIE culture words collection, 2017
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