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isotope

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noun
  • one of two or more forms of a chemical element with different atomic weight and different nuclear properties but the same chemical properties [Barron]

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WordNet:
isotope @ wordnet.princeton.edu
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isotope @ M-W.com
MSN Encarta:
isotope @ Encarta
American Heritage Dictionary of the English Language:
isotope @ AHD provided by Yahoo! Education
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isotope @ Answers.com
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