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noun:
- a form of coal with a top percentage of volatile matter that burns off with a smoky yellow fire. Also called soft coal.
- See under Bituminous.
- abundant with tarry hydrocarbons; burns readily with a smoky yellow fire
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adjective:
- a kind of coal which yields, when heated, a great deal of volatile bituminous matter. It burns with a yellow smoky fire.
How would you define bituminous coal?