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molecule

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noun
  • smallest unit into which a substance can be divided without a change in its chemical nature [Barron]

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Wiktionary:
molecule @ wiktionary
WordNet:
molecule @ wordnet.princeton.edu
Merriam-Webster Online:
molecule @ M-W.com
MSN Encarta:
molecule @ Encarta
American Heritage Dictionary of the English Language:
molecule @ AHD provided by Yahoo! Education
Answers.com:
molecule @ Answers.com
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