FAQs About the word underclay

粘土岩

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 => 下級生, underclass => 下級階級, undercharge => 低く請求する, underchaps => 頬, underchanter => サブボーカル,