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bac·te·ri·um

bacterium

 
pronunciation:
baek ti ri m
part of speech: noun
inflections: bacteria
definition: singular form of bacteria. Bacteria are tiny living things made up of one cell each. Bacteria live in most living things and in all parts of the earth. Most bacteria are useful to people, but some are harmful because they can cause disease.
similar words:
microbe
derivations: bacterial (adj.), bacterially (adv.)