| 1. | sodium hydroxide. |
| 2. | sodium monoxide. |
| 3. | sodium carbonate (def. 2). |
| 4. | sodium, as in carbonate of soda. |
| 5. | soda water. |
| 6. | a drink made with soda water, flavoring, such as fruit or other syrups, and often ice cream, milk, etc. |
| 7. | soda pop. |
| 8. | (in faro) the card turned up in the dealing box before one begins to play. |

| 1. | Also called soda ash. an anhydrous, grayish-white, odorless, water-soluble powder, Na2CO3, usually obtained by the Solvay process and containing about 1 percent of impurities consisting of sulfates, chlorides, and bicarbonates of sodium: used in the manufacture of glass, ceramics, soaps, paper, petroleum products, sodium salts, as a cleanser, for bleaching, and in water treatment. |
| 2. | Also called sal soda, soda, washing soda. the decahydrated form of this salt, Na2CO3·10H2O, used similarly. |
| 3. | the monohydrated form of this salt, Na2CO3·H2O, used similarly, esp. in photography. |

| a white, deliquescent, water-soluble solid, NaOH, usually in the form of lumps, sticks, chips, or pellets, that upon solution in water generates heat: used chiefly in the manufacture of other chemicals, rayon, film, soap, as a laboratory reagent, and in medicine as a caustic. |
| a white powder, Na2O, that reacts violently with water to produce sodium hydroxide. |
so·da (sō'də) n.
[Middle English sode, soda, saltwort, soda, from Old Italian soda, perhaps from Arabic suwayd, soda, soda-plant or suwayda, type of saltwort; see šwd in Semitic roots.] |
| soft drink n. In both senses also called soda pop; also called regionally cold drink, drink, pop1, soda, soda water, tonic.
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soda so·da (sō'də)
n.
Any of various forms of sodium carbonate.
Chemically combined sodium.
sodium hydroxide n.
A strongly alkaline compound used externally. Also called caustic soda.