Definition of terbium in US English:

terbium

noun

  • 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.’

Origin

Mid 19th century: modern Latin, from Ytterby, the name of a village in Sweden where it was discovered. Compare with erbium and ytterbium.

Pronunciation

terbium

/ˈtərbēəm//ˈtərbiəm/