Definitions

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

  • n. An artificially produced radioactive element with atomic number 105 whose most long-lived isotopes have mass numbers of 258, 261, 262, and 263 with half-lives of 4.2, 1.8. 34, and 30 seconds, respectively. Also called unnilpentium. See Table at element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A transuranic chemical element (symbol Db) with atomic number 105.
  • n. A rejected name for rutherfordium.

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

  • n. a transuranic element

Etymologies

After Dubna, Russia, the location of the United Institute of Nuclear Research.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Named after Dubna in Russia. (Wiktionary)

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