IPA: //ˈdaɪəʊˌlɛfɪn//
KK: /dɪoʊˈlɛfɪn/
A type of hydrocarbon that contains two double bonds between carbon atoms.
Diolefins are important in the production of synthetic rubber.
Diolefin → It is formed from "di-" (meaning two) and "olefin" (from Latin "olefina", meaning oil or oily). The term refers to a type of hydrocarbon that contains two double bonds, hence the prefix "di-" indicating two double bonds in the olefin structure.
Think of 'two' ('di-') double bonds in an 'oily' ('olefin') structure — that's what diolefin means.