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Comprehensive
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coal gas a gas used for lighting and heating that is produced by the distillation of bituminous coal. [1/2 definitions]
coal oil any fuel oil produced by distillation of bituminous coal.
coal tar a thick black liquid formed by the distillation of bituminous coal, used as a raw material in the creation of dyes, drugs, plastics, and paints.
soft coal see "bituminous coal."