microorganism

US /ˌmaɪkroˈɔrɡəˌnɪzəm/

UK /ˌmaɪkrəʊ'ɔ:gənɪzəm/

C2
n. (c./u.)Noun (Countable/Uncountable)Extremely small living thing that cannot be seen
Microorganisms can be found everywhere and they are a normal part of our lives.

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