Webster's Online Dictionary
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Definition: ETHYLIDENE

Part of Speech Definition
Expression 1. An unsymmetrical, divalent, hydrocarbon radical, C2H4 metameric with ethylene but written thus, CH3.CH to distinguish it from the symmetrical ethylene, CH2.CH2. Its compounds are derived from aldehyde. Formerly called also ethidene.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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

Definition: ETHYLIDENE

Part of SpeechDefinition
Expression1. An unsymmetrical, divalent, hydrocarbon radical, C2H4 metameric with ethylene but written thus, CH3.CH to distinguish it from the symmetrical ethylene, CH2.CH2. Its compounds are derived from aldehyde. Formerly called also ethidene.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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