FAQs About the word underclay

argile réfractaire

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

No synonyms found.

No antonyms found.

underclassman => élève de classe inférieure, underclass => Sous-classe, undercharge => sous-facturer, underchaps => Joues, underchanter => seconde basse,