Meaning Of The Word Underclay

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Underclay Meaning

Underclay Definition
Underclay Definition

What's The Definition Of Underclay?

underclay in American English
a bed of clay lying immediately beneath a coal seam, often used as a fireclay

underclay in British English
noun: a grey or whitish clay rock containing fossilized plant roots and occurring beneath coal seams. When used as a refractory, it is known as fireclay

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