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    bacteria

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    bacteria
    bac‧te‧ri‧a /bækˈtɪəriə $ -ˈtɪr-/ noun [plural] (singular bacterium /-riəm/)
     Date: 1800-1900
     Language: Modern Latin
     Origin: Greek bakterion 'stick, rod'; because of their shape
    very small living things, some of which cause illness or disease ⇨ virus
    —bacterial adjective:
        a bacterial infection