- a thick, sticky, brown to black liquid with a pungent odor, obtained by the destructive distillation of wood, coal, peat, shale, etc.: tars are composed of hydrocarbons and their derivatives, and are used for protecting and preserving surfaces, in making various organic compounds, etc.
- loosely any of the solids in smoke, as from tobacco
ME terre < OE teru < PGmc *terw(i)a-, substance from trees < IE base *deru-, tree
transitive verb tarred, tarring
to cover or smear with or as with tar