Ethylidene \E*thyl"i*dene\ (Chem.)
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.
Source: Webster's Revised Unabridged Dictionary (1913)
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