Olefiant a. : Forming or producing an oil; specifically, designating a colorless gaseous hydrocarbon called ethylene.

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Defination from the web:
Olefiant in the Online Dictionary. Meaning of Olefiant. Pronunciation of Olefiant. Translations of Olefiant. Olefiant synonyms, Olefiant antonyms. ... designating a colorless gaseous hydrocarbon called ethylene (olefiant gas). How to thank TFD for its existence? ...