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

  • noun An artificially produced radioactive element with atomic number 115 whose most stable confirmed isotopes have mass numbers of 287 and 288 with half-lives of 32 milliseconds and 87 milliseconds, respectively. 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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