Plastik plast plastic plastic plastica plastika plastique plástico πλαστικό פלסטיק pasta plastic (material) plastic (materials) A general term for any of a large and varied class of natural or synthetic organic materials that can be molded, extruded, or cast when soft or liquid, and then set into a rigid or slightly elastic form. Natural plastics include tree resins, beeswax, gutta-percha, horn, and clay. Synthetic plastics were first made in the 19th century. Plastics are used widely in manufacturing (AAT).