What does "olefin" mean?

Any of a class of unsaturated open-chain hydrocarbons such as ethylene; an alkene with only one carbon-carbon double bond.

What is a synonym for "olefin"?

Common synonyms include: alkene, olefine.

/ˈəʊləfɪn/ noun

noun ·Rare ·Advanced level

Noun

1
Any of a class of unsaturated open-chain hydrocarbons such as ethylene; an alkene with only one carbon-carbon double bond.
2
any unsaturated aliphatic hydrocarbon wordnet

From olefiant, "oil-producing".