| 1. | a drinking glass; tumbler. |
| 2. | a glass container for holding water, as for growing bulbs, plants, or the like. |
| 3. | a glass tube used to indicate water level, as in a boiler. |
| 4. | a device for observing objects beneath the surface of the water, consisting essentially of an open tube or box with a glass bottom. |
| 5. | sodium silicate. |
| any of several clear, white, or greenish water-soluble compounds of formulas varying in ratio from Na2O·3.75SiO2 to 2Na2O·SiO2: used chiefly in dyeing, printing, and fireproofing textiles and in the manufacture of paper products and cement. |
water glass n.
See soluble glass.