Definition of water glass in US English:

water glass

noun

  • 1A solution of sodium or potassium silicate. It solidifies on exposure to air and is used to make silica gel and for preserving eggs and hardening artificial stone.

    • ‘As the pH of water glass is lowered, colloidal particles of amorphous silica are formed.’
  • 2An instrument for making observations beneath the surface of water, consisting of a bucket with a glass bottom.

Pronunciation

water glass

/ˈwädər ˌɡlas/