Where does “cupreous” come from?

cupreous (English) comes from Latin cupreus, from Latin cūprum, from Latin cȳprium, from Ancient Greek Κύπρος, from Ancient Greek -ῐος, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

cupreous (English): A reddish-brown color, like that of polished...

Definitions

A reddish-brown color, like that of polished...

Ancestry of “cupreous”, step by step

Step	Language	Word	Meaning
1	Latin	cupreus	copper; copper-coloured
2	Latin	cūprum	copper (the metal)
3	Latin	cȳprium	—
4	Ancient Greek	Κύπρος	Cyprus
5	Ancient Greek	-ῐος	belonging to; of”, “belonging to”, “pertaining to
6	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →Every word from Ancient Greek Κύπρος →