(plas′tik) adjective
1. Giving form or fashion to matter.
2. Capable of being molded; pliable.
3. Pertaining to modeling or molding; sculptural.
4. Made of plastic.
5. Surg. Efficacious or instrumental in recreating or remodeling injured or destroyed protoplasm; also, capable of being thus renewed.
6. Slang Not genuine; sham: plastic moral values.
—noun
1. Anything moldable; specifically, any material, natural or synthetic, which may be fabricated into a variety of shapes, usually by the application of heat and pressure.
2. Chem. One of a class of organic compounds synthesized from hydrocarbons, proteins, cellulose, or resins, capable of being molded, extruded, cast, or otherwise fabricated into various shapes: usually in the plural, plas′tics. [<L plasticus <Gk. plastikos moldable <plastos formed <plassein form, mold]
—plas′ti·cal·ly adverb

Growing; developing; forming: cytoplastic. [<Gk. plastikos plastic]