noun

1. a hard, brittle substance made by fusing silicates with soda or potash, lime, and, sometimes, various metallic oxides into a molten mass that is cooled rapidly to prevent crystallization or annealed to eliminate stresses: various types of glass can be transparent, translucent, heat-resistant, flexible, shatterproof, photochromic, etc.
2. any substance like glass in composition, transparency, brittleness, etc.
3. glassware
4. 1. an article made partly or wholly of glass, as a drinking container, mirror, windowpane, telescope, barometer, etc.
   2. eyeglasses
   3. binoculars
5. the quantity contained in a drinking glass

Etymology: ME glas < OE glæs, akin to Ger glas < IE base *ĝhel-, to shine > gold, glint, glow

transitive verb

1. to put into glass jars for preserving
2. to mirror; reflect
3. to equip with glass panes; glaze
4. to look at through a telescope, etc.
5. to make glassy

intransitive verb

adjective