Medical Definition of salt
1a: a crystalline compound NaCl that is the chloride of sodium, is abundant in nature, and is used especially to season or preserve food or in industry—called also common salt, sodium chlorideb: a substance (as Glauber's salt) resembling common saltc: any of numerous compounds that result from replacement of part or all of the acid hydrogen of an acid by a metal or a group acting like a metal : an ionic crystalline compound
2salts pl a: a mineral or saline mixture (as Epsom salts) used as an aperient or catharticb: smelling salts
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