plastic

noun

• a synthetic material made from a wide range of organic polymers such as polyethylene, PVC, nylon, etc., that can be moulded into shape while soft, and then set into a rigid or slightly elastic form: mains pipes should be made of plastic or copper [count noun]:bottles can be made from a variety of plastics
• informal credit cards or other types of plastic card that can be used as money:he pays with cash instead of with plastic

adjective

• 1made of plastic:plastic bags
• artificial or unnatural:a holiday rep with huge white teeth and a plastic smile

• 2(of substances or materials) easily shaped or moulded:rendering the material more plastic
• relating to moulding or modelling in three dimensions, or to produce three-dimensional effects:the plastic arts
• (in science and technology) of or relating to the permanent deformation of a solid without fracture by the temporary application of force.

• 3 Biology exhibiting adaptability to change or variety in the environment.