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