coal tar

American  

noun

1. a thick, black, viscid liquid formed during the distillation of coal, that upon further distillation yields compounds, as benzene, anthracene, and phenol, from which are derived a large number of dyes, drugs, and other synthetic compounds, and that yields a final residuum coal-tar pitch, which is used chiefly in making pavements.

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coal tar British  

noun

1. a black tar, produced by the distillation of bituminous coal, that can be further distilled to yield benzene, toluene, xylene, anthracene, phenol, etc

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coal tar Scientific  

1. A thick, sticky, black liquid obtained through the destructive distillation (heating in the absence of air) of coal. It is used as a source of many organic compounds, such as benzene, naphthalene, and phenols, which are used in dyes, drugs, and other compounds.

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Other Word Forms

• coal-tar
  adjective

Etymology

Origin of coal tar

First recorded in 1775–85

Example Sentences

“It’s coal tar and it’s a known carcinogen and mostly you find it in industrial settings,” said Horney.

From Seattle Times • Mar. 22, 2018

“It had a big round tank and this heavy coal tar was dumped into the lake,” said Ed Monroe, a local historian who specializes in the city’s lakefront history.

From Washington Times • Jun. 4, 2017

A shampoo or an over-the-counter cream with salicylic acid can soften plaques; one with coal tar can reduce discomfort.

From Washington Post • Dec. 30, 2016

Bladder cancer, which can be set in motion by coal tar, metalworking fluids, and other workplace toxics, usually appears 15 to 40 years later.

From Slate • Nov. 5, 2015

The mine had a lot of the solvent derived from coal tar, but it was too volatile.

From "October Sky" by Homer Hickam