Where does “chloro-” come from?

chloro- (English) comes from Ancient Greek χλωρός, from Proto-Indo-European ghlo-.

chloro- (English): Green in color; Containing chlorine

Definitions

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

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