| 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.
|
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.
| sodium hydroxide
A white, corrosive, solid compound that absorbs water and carbon dioxide from the atmosphere and forms lye when in solution. Sodium hydroxide is toxic and strongly alkaline and is used to make chemicals and soaps and to refine petroleum. Chemical formula: NaOH. |