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Vinyl Vi"nyl, n. [L. vinum wine + -yl.] (Chem.) The hypothetical radical C2H3, regarded as the characteristic residue of ethylene and that related series of unsaturated hydrocarbons with which the allyl compounds are homologous., Ethenyl Eth"e*nyl, n. [Ethene + -yl.] (Chem.) (a) A trivalent hydrocarbon radical, CH3.C. (b) A univalent hydrocarbon radical of the ethylene series, CH2:CH; -- called also vinyl. See Vinyl.