(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

a synthetic material resembling clay but remaining soft; used as a substitute for clay or wax in modeling (especially in schools)

a synthetic substance that is fluorescent or phosphorescent; used to coat the screens of cathode ray tubes

any of various synthetic elastic materials whose properties resemble natural rubber

a polymer material which combines qualities of elastomers and plastics, such as rubber-like properties with the processing ability of plastic.