[so.da] n [It, fr. Ar suwwad, any of several saltworts from the ashes of which sodium carbonate is obtained] (1558) 1 a: sodium carbonate b: sodium bicarbonate c: sodium--used in combination "~ alum"
2. a: soda water 2a b: soda pop c: a sweet drink consisting of soda water, flavoring, and often ice cream
3: the faro card that shows faceup in the dealing box before play begins