- noun an electrode made of very thin glass, often used to measure pH value
- A half-cell in which potential differences are measured through a thin membrane of glass which is in contact with a reference solution and an unknown solution. The potential differences detected are due to differences in the concentrations of hydrogen ion, or another ion, between the two solutions. Utilized especially to determine the pH of aqueous solutions. Also called glass half-cell.
- synonymglass half-cell