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Ethical dative
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Webster's 1913 Dictionary

Ethidene Eth"i*dene, n. [From Ether.] (Chem.) Ethylidene. [Obs.]

Webster's 1913 Dictionary

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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