Definitions

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

  • noun An artificially produced radioactive element with atomic number 113 whose most stable isotope has mass number 284 and a half-life of approximately 0.5 seconds. 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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