carbarylPronunciation: /ˈkɑːbərʌɪl, -rɪl/Definition of carbaryl noun [mass noun] a synthetic insecticide used to protect crops and in the treatment of fleas and lice. Chemical formula: C12H11NO2 Origin: mid 20th century: from carbamate + -ylcarbaryl in other Oxford dictionaries Definition of carbaryl in the US English dictionary