tar

tar

noun \ˈtär\

Definition of TAR

1

: any of various dark brown or black bituminous usually odorous viscous liquids obtained by destructive distillation of organic material (as wood, coal, or peat); especially : one used medicinally (as to treat skin diseases)—see coal tar, juniper tar, pine tar

2

: a substance in some respects resembling tar; especially : a condensable residue present in smoke from burning tobacco that contains combustion by-products (as resins, acids, phenols, and essential oils)