Underclay definition

undərklā
A bed of clay lying immediately beneath a coal seam, often used as a fireclay.
noun
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(geology) A stratum of clay lying beneath a coal bed.
noun
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Other Word Forms

Noun

Singular:
underclay
Plural:
underclays

Origin of underclay

  • under- +"Ž clay

    From Wiktionary