Also found in: Dictionary, Thesaurus, Medical, Legal.
coal-tar pitch[′kōl ¦tär ‚pich]
Dark-brown to black amorphous residue from the redistillation of coal tar; melts at 150°F (66°C); used as a thermoplastic.
coal-tar pitch, tar
A dark brown to black hydrocarbon obtained by the distillation of coke-oven tar; softening point near 150°F (65°C); used in built-up roofing as a waterproofing agent.