Coal-gas

coal gas

noun
1.
a gas used for illuminating and heating, produced by distilling bituminous coal and consisting chiefly of hydrogen, methane, and carbon monoxide.
2.
the gas formed by burning coal.

Origin:
1800–10

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World English Dictionary
coal gas
 
n
a mixture of gases produced by the distillation of bituminous coal and used for heating and lighting: consists mainly of hydrogen, methane, and carbon monoxide

Collins English Dictionary - Complete & Unabridged 10th Edition
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