Castile Soap Definition
    noun
  
 A fine, mild, hard soap prepared from olive oil and sodium hydroxide.
 Webster's New World 
Other Word Forms of Castile Soap
Noun
Singular:
 Castile soapPlural:
 castile-soapsOrigin of Castile Soap
-  From Castile in Spain, from which it originally came. From Wiktionary 
- After Castile - From American Heritage Dictionary of the English Language, 5th Edition 
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