Hypertext Webster Gateway: "ethylidene"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
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