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The Collaborative International Dictionary
Nonylene

Nonylene \Non"y*lene\, n. [Nonane + ethylene.] (Chem.) Any one of a series of metameric, unsaturated hydrocarbons C9H18 of the ethylene series.

Wiktionary
nonylene

n. (context chemistry English) Any of a series of metameric unsaturated hydrocarbons, C9H18, of the ethylene series.