A bivalent chemical radical derived from ethylene; a two-bonded fragment used in chemical nomenclature and synthesis.
From 'ethid-' (from ethylene chemistry) plus '-ene' (a suffix indicating a chemical group with two bonds or a double bond).
Ethidene is the kind of word that makes chemistry fascinating to specialists and completely impenetrable to everyone else—it names an invisible fragment that only exists in reactions and formulas.
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