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Answer for the clue "Ethylene or propylene ", 6 letters:
alkene

Alternative clues for the word alkene

Word definitions for alkene in dictionaries

Wikipedia Word definitions in Wikipedia
In organic chemistry , an alkene is an unsaturated hydrocarbon that contains at least one carbon –carbon double bond . The words alkene, olefin , and olefine are used often interchangeably (see nomenclature section below). Acyclic alkenes, with only one ...

WordNet Word definitions in WordNet
n. any unsaturated aliphatic hydrocarbon [syn: olefine , olefin ]

Wiktionary Word definitions in Wiktionary
n. (context organic chemistry English) An unsaturated, aliphatic hydrocarbon with one or more carbon–carbon double bonds.

Usage examples of alkene.

Ladies and gentlemen, I give you the portrait of Admiral Alkene, late of the Tholian Assembly!

Rom had shared a rare moment of rapport in their guilty, private pleasure every time Dukat came to the bar with whoever his latest comfort woman was and regaled her with the story of Admiral Alkene, ending with a grandiloquent toast and salute to the mural.