Bacterium definitions

băk-tîr'ē-əm
noun
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Any of various prokaryotic microorganisms of the domain Bacteria that may be free-living, saprophytic, commensal, or pathogenic and that vary widely in terms of morphology, oxygen tolerance, nutritional and temperature requirements, and motility.
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Any of the prokaryotic organisms, such as an archaeon. Not in scientific use.
noun
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Any of various prokaryotic microorganisms of the domain Bacteria that may be free-living, saprophytic, commensal, or pathogenic and that vary widely in terms of morphology, oxygen tolerance, nutritional and temperature requirements, and motility.
noun
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Any of the prokaryotic organisms, such as an archaeon. Not in scientific use.
noun
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Any of a large group of one-celled organisms that lack a cell nucleus, reproduce by fission or by forming spores, and in some cases cause disease. They are the most abundant lifeforms on Earth, and are found in all living things and in all of the Earth's environments. Bacteria usually live off other organisms. Bacteria make up most of the kingdom of prokaryotes (Monera or Prokaryota), with one group (the archaea) sometimes classified as a separate kingdom.
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(microbiology) A single celled organism with no nucleus.
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Origin of bacterium

New Latin bactērium from Greek baktērion diminutive of baktron rod bak- in Indo-European roots