n 1  :  any of various dark brown or black bituminous usu. odorous viscous liquids obtained by destructive distillation of organic material (as wood, coal, or peat) : esp  :  one used medicinally <the classic and still effective drugs that doctors use to treat seborrheic dermatitis may include … -The Medicine Show>  - see JUNIPER TAR   2  :  a substance in some respects resembling tar : esp  :  a condensable residue present in smoke from burning tobacco that contains combustion by-products (as resins, acids, phenols, and essential oils) .
 
 
 
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