Dictionary
chlor-
a combining form meaning “green,” used in the formation of compound words:
chlorine. Also, esp. before a consonant,chloro-1.chlor-
a combining form used in the names of chemical compounds in which chlorine is present:
chloramine. Also, esp. before a consonant,chloro-2.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.