• (n.) A univalent hydrocarbon radical of the ethylene series, CH2:CH; -- called also vinyl. See Vinyl. • (n.) A trivalent hydrocarbon radical, CH3.C. Found on http://thinkexist.com/dictionary/meaning/ethenyl/
Eth'e·nyl noun [ Ethene + - yl .] (Chemistry) (a) A trivalent hydrocarbon radical, CH 3 .C. (b) A univalent hydrocarbon radical of the ethylene series, CH 2 :CH; -- called also vinyl . See Vinyl . Found on http://www.encyclo.co.uk/webster/E/70