GL`ASS, n. L. glastum glesid, blueness. Greenness is usually named from vegetation or growing, as L. viridis, from vireo.

1. A hard, brittle, transparent, factitious substance, formed by fusing sand with fixed alkalies.

In chimistry, a substance or mixture, earthy, saline or metallic, brought by fusion to the state of a hard, brittle, transparent mass, whose fracture is conchoidal.

2. A glass vessel of any kind as a drinking glass.
3. A mirror a looking-glass.
4. A vessel to be filled with sand for measuring time as an hour-glass.
5. The destined time of man's life. His glass is run.
6. The quantity of liquor that a glass vessel contains. Drink a glass of wine with me.
7. A vessel that shows the weight of the air.
8. A perspective glass as an optic glass.
9. The time which a glass runs, or in which it is exhausted of sand. The seamen's watch-glass is half an hour. We say, a ship fought three glasses.
10. Glasses, in the plural, spectacles.

GL`ASS, a. Made of glass vitreous as a glass bottle.

GL`ASS, To see as in a glass. Not used.

1. To case in glass. Little used.
2. To cover with glass to glaze.

In the latter sense, glaze is generally used.