Where does “καρκινίας” come from?

καρκινίας (Ancient Greek) comes from Ancient Greek καρκίνος, from Proto-Indo-European karkros.

Ancestry of “καρκινίας”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	καρκίνος	crab; Cancer, the zodiac sign; sore, ulcer,...
2	Proto-Indo-European	karkros	—

καρκινίας — Etymology, Origin & Word History | Etymology Explorer