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

  • n. An artificially produced radioactive element with atomic number 112 whose isotope has a mass number of 277 and a half-life of 280 milliseconds. Also called ununbium.

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

  • n. a radioactive transuranic element


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