Definition of fuller’s earth noun from the Oxford Advanced Learner's Dictionary

 

fuller’s earth

 noun
noun
BrE BrE//ˌfʊləz ˈɜːθ//
 
; NAmE NAmE//ˌfʊlərz ˈɜːrθ//
 
[uncountable]
 
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a type of clay used for cleaning cloth and making it thicker
See the Oxford Advanced American Dictionary entry: fuller’s earth