Wiktionary
chlorotoluene
n. (context organic chemistry English) Any chlorinated derivative of toluene
Wikipedia
Chlorotoluene
Chlorotoluene is a group of three isomeric chemical compounds. They (ortho-chlorotoluene, meta-chlorotoluene, and para-chlorotoluene) consisist of a disubsituted benzene ring with one chlorine atom and one methyl group.