olefin

noun

ole·​fin ˈō-lə-fən 

1

: alkene

2

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

olefinic

ˌō-lə-ˈfi-nik 

adjective

Examples of olefin in a Sentence

Recent Examples on the Web

They’re made with a blend that includes olefin, a durable yet lightweight synthetic fiber that pulls moisture away from your skin. —Christa Sgobba, Glamour, 31 Mar. 2026

Cocamidopropyl betaine is a mild soap-free surfactant derived from coconut oil, while sodium C14-16 olefin sulfonate is a stronger synthetic chemical. —Allure Editors, Allure, 24 Mar. 2026

Common materials for outdoor rugs include polyester, jute, olefin, nylon, sisal, and polypropylene. —Julia Harrison, Architectural Digest, 17 Mar. 2026

Always read the care label to be sure that the outer fabric, which can be a natural or synthetic fiber like olefin, is washable. —Mary Marlowe Leverette, The Spruce, 14 Jan. 2026

Word History

Etymology

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

First Known Use

1860, in the meaning defined at sense 1

Rhymes for olefin

• polyolefin

Kids Definition

olefin

noun

ole·​fin ˈō-lə-fən 

: a chemical compound made up of carbon and hydrogen atoms that contains at least one double bond

especially : any of various long-chain synthetic polymers (as of ethylene) used especially as textile fibers

Medical Definition

olefin

noun

ole·​fin ˈō-lə-fən 

: alkene

olefinic

ˌō-lə-ˈfin-ik 

adjective