Webster's Online Dictionary
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Definition: HEPTYLENE

Part of Speech Definition
Noun 1. A colorless liquid hydrocarbon, C7H14, of the ethylene series; also, any one of its isomers. Called also heptene.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Heptylene" was first used in popular English literature: sometime before 1914. (references)

Definition: HEPTYLENE

Part of SpeechDefinition
Noun1. A colorless liquid hydrocarbon, C7H14, of the ethylene series; also, any one of its isomers. Called also heptene.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "HEPTYLENE" was first used in popular English literature: sometime before 1914. (references)