A chemical compound or radical related to ethyl groups, sometimes used in older chemical nomenclature for ethene or related hydrocarbons.
From ethyl (from ethane, the two-carbon hydrocarbon) + -in suffix (common in older chemistry naming). This term is largely archaic, replaced by modern IUPAC nomenclature.
Ethylin shows how chemical terminology evolves—scientists realized that clearer, more systematic names were needed, so this term was retired in favor of more logical modern names like ethene and ethylene.
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