A tar formed from distillation of bituminous coal; coal tar can be further distilled to give various aromatic compounds WordNet 3.0 & Open English WordNet

Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. Wikipedia

Chemical mixture Wikidata

A brown or black liquid of high viscosity consisting of a mixture of phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds. OmegaWiki

A black, viscous tar made by the destructive distillation of coal (to make coke and town gas); it contains a great number of compounds including hydrocarbons and phenols; used in the preparation of medicated soap and shampoo, and industrially for the manufacture of very many products. Wiktionary

Black viscous tar. Wiktionary (translation)