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
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)