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English definition of “microbe”

microbe

noun [C] uk   /ˈmaɪ.krəʊb/ us    /-kroʊb/
a very small living thing, especially one that causes disease, that can only be seen with a microscopeBacteria, moulds, germs and viruses
(Definition of microbe from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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