Where does “cloro-” come from?

cloro- (Portuguese) comes from Ancient Greek χλωρός, from Proto-Indo-European ghlo-.

cloro- (Portuguese): chloro-

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	χλωρός	greenish-yellow, pale green; pale, pallid; fresh,...
2	Proto-Indo-European	ghlo-	—

cloro- — Etymology, Origin & Word History | Etymology Explorer