WordNet (r) 3.0 (2006):

hassium
    n 1: a radioactive transuranic element [syn: hassium, Hs,
         element 108, atomic number 108]

The Elements (07Nov00):

hassium
Competing name for unniloctium, the 108th element, proposed by its
German discoverers and supported by the American Chemical Society.
Finally in 1997 the IUPAC decided to use Hassium as the official name of
the 108th element.