chlor- 1
a combining form meaning "green," used in the formation of compound words: chlorine.
Also, esp. before a consonant, chloro- 1 .
[ comb. form of Gk chlorós light green, greenish yellow; akin to YELLOW, GOLD, GLEAM ]
chlor- 2
a combining form used in the names of chemical compounds in which chlorine is present: chloramine.
Also, esp. before a consonant, chloro- 2 .