Resin

A natural substance secreted by plants (mostly trees), which is transparent to translucent yellow or brown, such as copal, rosin, and amber, used principally in lacquers, varnishes, inks, adhesives, synthetic plastics, and turpentine. Also, synthetic plastics, including thermoplastic materials such as polyvinyl, polystyrene, and polyethylene, and thermosetting materials such as polyesters, epoxies, polyurethane, and silicones that are used with fillers, stabilizers, pigments, and other components to form plastics.(pr. RE-zən)