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coal seam

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noun

a bed of coal.

Origin of coal seam

First recorded in 1840–50

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for coal seam

Historical Examples of coal seam

The mining engineer, Monsieur Arnaud, was of opinion that on sinking deeper into the coal-seam a better quality would be met with.
Cruise of the 'Alert'
R. W. Coppinger