Webster's English Dictionary

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soda

so.da \'so-d-*\ n [It, barilla plant, soda, fr. (assumed) ML, barilla 
   plant] 1a: SODIUM CARBONATE  1b: SODIUM BICARBONATE  1c: SODIUM HYDROXIDE  
   1d: sodium oxide Na2O  1e: SODIUM - used in combination {~ alum}  2a: SODA 
   WATER  2b: a sweet drink consisting of soda water, flavoring, and often ice 
   cream  3: the faro card that shows face up in the dealing box before play 
   begins