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Definition of Glauber's salt
1. Noun. (Na2SO4.10H2O) a colorless salt used as a cathartic.
Medical Definition of Glauber's salt
1. Na2SO4-10H2O;an ingredient of many of the natural laxative waters, and also used as a hydragogue cathartic. Synonym: Glauber's salt. (05 Mar 2000)