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ace·to·chlor | \ ə-ˈsē-tō-ˌklȯr 
\
\Definition of acetochlor
: an herbicide C14H20ClNO2 that is typically applied before the emergence of crop seedlings aboveground and is used to control grasses and broad-leaved weeds
… acetochlor, a herbicide commonly used by farmers to control weeds in corn.— Mary Divine & Dennis Lien, St. Paul (Minnesota) Pioneer Press, 26 Sept. 2007
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Time Traveler for acetochlor
The first known use of acetochlor was circa 1971
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