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Definition of plastic
a synthetic material made from a wide range of organic polymers such as polyethylene, PVC, nylon, etc., that can be molded into shape while soft and then set into a rigid or slightly elastic form. informal credit cards or other types of plastic card that can be used as money:he pays with cash instead of with plastic
1made of plastic:plastic bags looking or tasting artificial:long-distance flights with their plastic food she smiled a little plastic smile 2(of substances or materials) easily shaped or molded:rendering the material more plastic (in art) of or relating to molding or modeling in three dimensions, or producing three-dimensional effects. (in science and technology) of or relating to the permanent deformation of a solid without fracture by the temporary application of force. offering scope for creativity:the writer is drawn to words as a plastic medium Biology exhibiting adaptability to change or variety in the environment.