ole·​fin | \ ˈō-lə-fən How to pronounce olefin (audio) \

Definition of olefin

1 : alkene
2 : a synthetic fiber (such as polypropylene) derived from an alkene

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Other Words from olefin

olefinic \ ˌō-​lə-​ˈfi-​nik How to pronounce olefinic (audio) \ adjective

Examples of olefin in a Sentence

Recent Examples on the Web

However a glut of new olefin capacity across the industry decreased sale prices and margins, Westlake said, and its olefins income fell by 42 percent. Marissa Luck, Houston Chronicle, "Lower chemical prices hurt Westlake's profits," 6 Aug. 2019 On its olefins segment, higher sales of polyethylene, lower feedstock costs and lower impacts from maintenance activity help to partially offset the blow of lower product pricing for sales of common types of plastic, Westlake said. Marissa Luck, Houston Chronicle, "Lower chemical prices hurt Westlake's profits," 6 Aug. 2019 The Houston alkylation unit upgrades isobutane and refinery olefins into high value alkylate product, Valero said. Houston Chronicle, "Profits plummet at Valero Energy amid lower refining, ethanol earnings," 25 July 2019 Wu said the joint venture has secured long-term purchase contracts from Chinese companies that convert methanol into olefins. Hal Bernton, The Seattle Times, "Meet the Chinese businessman behind the $1.8B plan to make methanol in Washington state," 5 July 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'olefin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of olefin

1860, in the meaning defined at sense 1

History and Etymology for olefin

International Scientific Vocabulary, from French (gaz) oléfiant ethylene, from Latin oleum

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Statistics for olefin

Last Updated

26 Aug 2019

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Time Traveler for olefin

The first known use of olefin was in 1860

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More Definitions for olefin


ole·​fin | \ ˈō-lə-fən How to pronounce olefin (audio) \

Medical Definition of olefin

: alkene

Other Words from olefin

olefinic \ ˌō-​lə-​ˈfin-​ik How to pronounce olefinic (audio) \ adjective

More from Merriam-Webster on olefin

Britannica.com: Encyclopedia article about olefin

Comments on olefin

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a topic to which one constantly reverts

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