from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An artificially produced radioactive element with atomic number 114 whose most stable isotope has a mass number of 289 with a half-life of approximately 2.7 seconds. Radioactive decay of all isotopes is chiefly by alpha-particle emission. cross-reference: Periodic Table.

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

  • noun a radioactive transuranic element


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