bituminous-coal

bituminous coal

noun
a mineral coal that contains volatile hydrocarbons and tarry matter and burns with a yellow, smoky flame; soft coal.

Origin:
1875–80

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Collins
World English Dictionary
bituminous coal
 
n
Also called: soft coal a soft black coal, rich in volatile hydrocarbons, that burns with a smoky yellow flame. Fixed carbon content: 46--86 per cent; calorific value: 1.93 × 107 -- 3.63 × 107 J/kg

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
bituminous coal  [%PREMIUM_LINK%]     (bĭ-t'mə-nəs)  Pronunciation Key 
A soft type of coal that burns with a smoky, yellow flame. Bituminous coal is the most abundant form of coal. It has a high sulfur content, and when burned, gives off sulfurous compounds that contribute to air pollution and acid rain. Compare anthracite, lignite.

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