Also Called: Coal-tar distillation; Tar, coal; Coal tar; [The by-product from the destructive distillation of coal. Almost black semisolid. A complex combination of aromatic hydro-carbons, phenolic compounds, nitrogen bases and thiophene.]; Coal Tar (see Coal Tars and Coal-Tar Pitches); Tar, coal [Coal tar];Coal tars (see Coal-tar distillation);Coal tar (The by-product from the destructive distillation of coal. Almost black semisolid. A complex combination of aromatic hydro-carbons, phenolic compounds, nitrogen bases and thiophene.)