catflap.org Online Dictionary Query

  refractory clay /ɹɪfɹˈaktəɹi klˈeɪ/
  feuerfester Ton
     Synonym: fire clay
  
   see: clay, argil, potter's earth, slip, lean clay, sods, astringent clay, ball clay, drawn clay, banded clay, leaf clay, varved clay, sinople, mudstone, fat clay, rich clay, heavy clay, soapy clay, burnt clay, expanded clay, expansive clay, long clay, sticky clay, meagre clay, sandy clay, green clay, marly clay, crumbly clay, silty clay, drab clay, black cotton soil, consolidated clay, shattered clay, slickensided clay, blunge clay
  

  refractory clay /ɹɪfɹˈaktəɹi klˈeɪ/
  feuerfester Ton , Feuerfestton , Feuerton , Schamotteton 
           Note: Keramik
     Synonym: fireclay
  
           Note: ceramics