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The Collaborative International Dictionary of English v.0.48:

Ethidene \Eth"i*dene\, n. [From Ether.] (Chem.) Ethylidene. [Obs.] [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

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. [1913 Webster]