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Definition of Sodium sulfite
1. Noun. (chemistry) The sodium salt of sulfurous acid, Na2SO3, used as a food preservative, in photography and in many industrial applications. ¹
¹ Source: wiktionary.com
Medical Definition of Sodium sulfite
1. Na2SO3-7H2O;has been used for the relief of intestinal fermentation, and externally for aphthous stomatitis. (05 Mar 2000)