The chemical element of atomic number 65, a silvery-white metal of the lanthanide series. The main use of terbium is in making semiconductors.
- ‘Green light is also emitted from some lanthanide elements: lanthanum, cerium, and terbium.’
Mid 19th century: modern Latin, from Ytterby, the name of a village in Sweden where it was discovered. Compare with erbium and ytterbium.