refers to a material in a glassy state. In such a state, the constituent atoms
do not exhibit the long-range order that is characteristic of crystals
. However, they still exhibit short-range order -- the separation of atoms and/or the lengths of covalent bonds
are very close to their typical equilibrium
Under certain conditions, vitreous materials may begin to rearrange themselves into crystals. This process is referred to as devitrification.
See the entry on glass for more information.