Medical Definition of paraffin
1a: a waxy crystalline flammable substance obtained especially from distillates of wood, coal, petroleum, or shale oil that is a complex mixture of hydrocarbons and is used chiefly in coating and sealing, in candles, in rubber compounding, and in pharmaceuticals and cosmeticsb: any of various mixtures of similar hydrocarbons including mixtures that are semisolid or oily
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