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underclay

underclay is defined in Webster's Unabridged Dictionary (1913) with 1 sense. The full text of each entry is reproduced verbatim below.

Definitions

1.A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

Related questions

What does "underclay" mean?

Reverse-dictionary questions

Definition-first questions whose answer is underclay.

What is a stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria called?

Sources

Definitions: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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