NCIt definition : A synthetic aryl dialkyl phosphate compound and organophosphate acetylcholinesterase
inhibitor that is the active metabolite of the insecticide parathion and is used as
a pesticide. It is characterized as a reddish-yellow oily liquid with a faint fruity
odor, and exposure occurs by inhalation, ingestion, or contact.;
Alternative definition : CDISC: The organophosphorus agent paraoxon.;