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Definition of Castile soap
1. Noun. A good hard soap made from olive oil and sodium hydroxide.
Generic synonyms: Soap
Medical Definition of Castile soap
1. A soap made with olive oil, or some other suitable oil or fat, and sodium hydroxide; used as a detergent, and in the form of a suppository or soapsuds enema for constipation; used also as an excipient in pills. Synonym: Castile soap. (05 Mar 2000)