from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An artificially produced radioactive element with atomic number 108 whose most long-lived isotopes have mass numbers of 264 and 265 with half-lives of 0.08 milliseconds and 2 milliseconds, respectively. Also called unniloctium. See Table at element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An artificially-produced transuranic chemical element (symbol Hs) with atomic number 108.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a radioactive transuranic element


From Medieval Latin Hassia, Hesse (German state containing Darmstadt, where the element was first synthesized).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From the Latin form of the German state of Hessen, the location of the institute where the element was first synthesized. (Wiktionary)


  • Researchers at Lawrence Berkeley National Laboratory in California saw the isotopes of rutherfordium, seaborgium, hassium, darmstadtium, and copernicium by watching the decay of the yet-to-be-named element 114, a synthetic element first produced about a decade ago.

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