Definition of hassium in English:



mass noun
  • The chemical element of atomic number 108, a very unstable element made by high-energy atomic collisions.

    See also hahnium
    • ‘One potential candidate for such a long-living element is hassium, which contains about 180 neutrons.’
    • ‘They have anywhere from 13 isotopes to one isotope (e.g., hassium and meitnerium).’
    • ‘The researchers established that hassium forms a gaseous oxide similar to that of osmium, confirming that hassium, like osmium, is a member of group 8 of the periodic table and should be placed directly under it.’
    • ‘Element 108 is called hassium, after the German state of Hesse wherein Darmstadt is situated.’
    • ‘Hassium does not occur in nature, and it has no isotopes that last long enough to allow significant quantities to be accumulated.’


Modern Latin, from Latin Hassias ‘Hesse’ (the German state); it was discovered in Darmstadt in 1984.