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microorganism noun

  /ˌmaɪ.kɹoʊˈɔɹ.ɡəˌnɪz.m̩/ , /ˌmaɪ.kɹəʊˈɔː.ɡəˌnɪz.m̩/
  • (microbiology) An organism that is too small to be seen by the unaided eye; especially, a single-celled organism, such as a bacterium.
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