parathionPronunciation: /ˌparəˈθʌɪən/Definition of parathion noun [mass noun] a highly toxic synthetic organophosphorus compound containing phosphorus and sulphur, used as an agricultural insecticide. Origin: 1940s: from para-1 (sense 2) + thio- + -onparathion in other Oxford dictionaries Definition of parathion in the US English dictionary
