Generic name for certain synthetic or semisynthetic materials that can be molded or extruded into objects or films or filaments or used for making e.g. coatings and adhesives WordNet 3.0 & Open English WordNet

Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Wikipedia

Material of a wide range of synthetic or semi-synthetic organic solids Wikidata

A polymeric material (usually organic) of large molecular weight which can be shaped by flow; usually refers to the final product with fillers, plasticizers, pigments, and stabilizers included (versus the resin, the homogeneous polymeric starting material); examples are polyvinyl chloride, polyethylene, and urea-formaldehyde. OmegaWiki

Any solid but malleable substance. Wiktionary