olefinWiktionary 原文词源说明From olefiant, "oil-producing".释义（英文）名词 Noun(organic chemistry) Any of a class of unsaturated open-chain hydrocarbons such as ethylene; an alkene with only one carbon-carbon double bond.词族派生词（10）cycloolefindiolefinelastolefinhydrofluoroolefinnitroolefinolefinationolefinicpolyfluoroolefinpolyolefinolefin metathesis