ˌparəˈthīˌän noun
( -s )
Etymology: para- (I) + thio phosphate + -on
: a liquid thiophosphate agricultural insecticide (C 2 H 5 O) 2 PS(OC 6 H 4 NO 2 ) of extreme toxicity to mammals as well as insects; O,O -diethyl O-para -nitro-phenyl thiophosphate