Underclay Definition
 undərklā 
    noun
  
 A bed of clay lying immediately beneath a coal seam, often used as a fireclay.
 Webster's New World 
Other Word Forms of Underclay
Noun
Singular:
 underclayPlural:
 underclaysOrigin of Underclay
-  under- +"Ž clay From Wiktionary 
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