A by-product obtained during the destructive distillation of bituminous coal; a very dark semisolid of characteristic naphthalenelike odor and a sharp, burning taste; used in the treatment of skin diseases.
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coal tar 'kōl- n tar obtained by distillation of bituminous coal and used in the treatment of some skin diseases by direct local application to the skin
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tar obtained as a by-product of the destructive distillation of bituminous coal, used as a raw material for plastics, solvents, waterproofing compounds, sealants, and various other organic chemicals. If it is ingested or its fumes are inhaled it is toxic and carcinogenic; see also pitch and pitch poisoning. [USP] a preparation of coal tar used as a topical antieczematic and antipsoriatic.Medical dictionary. 2011.