Bacteria (noun) Definition, Meaning & Examples

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plural noun, singular bac·te·ri·um [bak-teer-ee-uhm]. /bækˈtɪər i əm/. Microbiology.
  1. ubiquitous one-celled organisms, spherical, spiral, or rod-shaped and appearing singly or in chains, comprising numerous and variously classified phyla: among the inestimable number of species are those involved in fermentation, putrefaction, infectious diseases, and nitrogen fixation.
noun (used with a singular or plural verb)Microbiology.
  1. (in the three-domain system of classification) the taxonomic domain comprising the bacteria.
pl n singular -rium (-rɪəm)
  1. a very large group of microorganisms comprising one of the three domains of living organisms. They are prokaryotic, unicellular, and either free-living in soil or water or parasites of plants or animals
    Bacteria (noun) Definition, Meaning & Examples

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