Wiktionary
metolachlor
n. (context organic compound English) An aniline derivative and chloroacetanilide herbicide, highly effective against grasses.
Wikipedia
Metolachlor
Metolachlor is an organic compound that is widely used as an herbicide. It is a derivative of aniline and is a member of the chloroacetanilide herbicides. It is highly effective toward grasses but its application is also controversial.