alachlor
noun
al·a·chlor ˈa-lə-ˌklȯr 
: an herbicide C14H20ClNO2 derived from aniline and used to control grasses and broadleaved weeds among crop plants
Word History
Etymology
ala- (perhaps from rearranged letters of acetanilide) + chlor-
First Known Use
1970, in the meaning defined above