(n.) 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.

Bakelite Buna Celluloid Formica Lucite Mylar PVC Perspex Plexiglas Styrofoam Teflon acetate acetate nitrate alkyd aminoplast casein plastic cellophane cellulose acetate cellulose ether cellulose nitrate cellulosic coumarone-indene epoxy fluorocarbon plastic furane lignin melamine multiresin neoprene nitrate nylon phenolic urea polyester polymeric amide polypropylene polystyrene polyvinyl chloride resinoid silicone resin tetrafluoroethylene urea urea formaldehyde vinyl