Acceptable For Game Play - US & UK word lists

This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

The American Heritage® Dictionary of the English Language, 4th Edition
  • n. A type of atom specified by its atomic number, atomic mass, and energy state, such as carbon 14.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. An atomic nucleus specified by its atomic number and atomic mass.
  • Word Usage
    "The discovery has the potential to revolutionise pre-clinical cancer research and clinical diagnostic practice, and it makes use of compounds that have already been approved for treating patients: the anti-cancer drug bevacizumab (Avastin) and Copper-64, a radioactive copper nuclide, which is approved by the US Food and Drug Administration (FDA) for some clinical trials."
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