IPA: //ˈbjuːtɪliːn//
KK: /ˈbjuːtɪliːn/
A type of hydrocarbon that is a gas and has the chemical formula C4H8, commonly used in the production of synthetic rubber and other chemicals.
Butylene is often used in the manufacturing of various plastics and synthetic materials.
Butylene is derived from "butyric" (from Latin "butyrum", meaning butter) and the suffix "-ene" (indicating an alkene, a type of hydrocarbon). The word refers to a type of hydrocarbon that is related to butyric acid, which is named for its association with butter.
Think of 'butyric' which relates to butter, and remember that 'butylene' is a type of hydrocarbon associated with that same root.