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|Noun||1.||synthetic substance - a compound made artificially by chemical reactions|
Plasticine - a synthetic material resembling clay but remaining soft; used as a substitute for clay or wax in modeling (especially in schools)
phosphor - a synthetic substance that is fluorescent or phosphorescent; used to coat the screens of cathode ray tubes
chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight