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chestnut coal

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noun
anthracite coal in sizes ranging from 1 3/16 to 1 5/8 inches (3 to 4 centimeters).
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Also called nut coal.

Origin of chestnut coal

An Americanism dating back to 1805–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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