The Collaborative International Dictionary
Heptylene
Heptylene \Hep"tyl*ene\, n. (Chem.) A colorless liquid hydrocarbon, C7H14, of the ethylene series; also, any one of its isomers. Called also heptene.
Wiktionary
heptylene
n. (context organic compound English) A colourless liquid hydrocarbon, C7H14, of the ethylene series, or any of its isomers.