Where does “κόλουρος” come from?

κόλουρος (Ancient Greek) comes from Ancient Greek οὐρά, from Proto-Indo-European ors- — tail.

κόλουρος (Ancient Greek): dock-tailed, stump-tailed; truncated; colure,...

Definitions

κόλουρος traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Ancient Greek	οὐρά	the tail, of a lion, dog etc; the rear-guard,...
2	Proto-Indo-European	ors-	tail

Step	Language	Word	Meaning
1	Ancient Greek	κόλος	docked; hornless or stump horned
2	Proto-Indo-European	ḱelh₂-	to pierce, strike; to stick; prick; stab