sodium carbonate n a sodium salt of carbonic acid used esp. in making soaps and chemicals, in water softening, in cleaning and bleaching, and in photography: as
a) a hygroscopic crystalline anhydrous strongly alkaline salt Na2CO3
b) WASHING SODA
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[NF] the disodium salt of carbonic acid, used as an alkalizing agent in pharmaceutical preparations. Called also sal soda.Medical dictionary. 2011.