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microorganism [microorganisms]▼(an organism too small to be seen by unaided eye)noun[UK: ˌmaɪk.rəʊ ˈɔːɡ.ə.ˌnɪz.əm] [US: ˌmaɪk.roʊ ˈɔːrɡ.ə.ˌnɪz.əm]
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