- 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.
- any substance like glass in composition, transparency, brittleness, etc.
- an article made partly or wholly of glass, as a drinking container, mirror, windowpane, telescope, barometer, etc.
- [pl.] eyeglasses
- [pl.] binoculars
- the quantity contained in a drinking glass
- Slang, Basketball a backboard, esp. when made of a transparent substance: with the
Origin of glassMiddle English glas from Old English glæs, akin to German glas from Indo-European base an unverified form ?hel-, to shine from source gold, glint, glow
- to put into glass jars for preserving
- to mirror; reflect
- to equip with glass panes; glaze
- to look at through a telescope, etc.
- to make glassy