Any unsaturated aliphatic hydrocarbon

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
olefin \o"le*fin\, olefine \o"le*fine\([=o]"l[-e]*f[i^]n or (Chem.) Olefiant gas, or ethylene. See Ethylene . Hence: (Chem.) Any one of the series of unsaturated hydrocarbons of which ethylene is the type; a member of the alkene series of hydrocarbons; ...

Wiktionary Word definitions in Wiktionary
n. 1 (context chemistry English) olefiant gas, or ethylene 2 (context chemistry by extension English) any of the series of unsaturated hydrocarbons of which ethylene is a type

WordNet Word definitions in WordNet
n. any unsaturated aliphatic hydrocarbon [syn: alkene , olefin ]