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Definition of microorganism noun from the Oxford Advanced Learner's Dictionary

microorganism

noun

/ˌmaɪkrəʊˈɔːɡənɪzəm/

/ˌmaɪkrəʊˈɔːrɡənɪzəm/

(specialist)

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a very small living thing that you can only see under a microscope

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See microorganism in the Oxford Learner's Dictionary of Academic English

Check pronunciation: microorganism

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noun

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