Bacteria definitions

băk-tîr'ē-ə
Any of a division (Bacteria) of monerans, microorganisms which are typically one-celled, have no chlorophyll, multiply by simple division, and can be seen only with a microscope: they occur in three main forms, spherical (cocci), rod-shaped (bacilli), and spiral (spirilla): some bacteria cause diseases such as pneumonia and anthrax, and others are necessary for fermentation, nitrogen fixation, etc.
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The definition of bacteria are microorganisms that are the basis of fermentation and infectious diseases.

An example of bacteria are the organisms that cause common human illnesses like strep throat.

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Plural form of bacterium.
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(US, proscribed) Alternative form of bacterium.
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(US) A type, species, or strain of bacterium.
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(pejorative, slang) A derisive term for a lowlife or a slob (could be treated as plural or singular).
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(dated, medicine) An oval bacterium, as distinguished from a spherical coccus or rod-shaped bacillus.
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In the three-domain system, a taxonomic domain comprising the single kingdom also called Bacteria, containing about 25 phyla.
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In the two-empire system, a taxonomic kingdom, within domain Prokaryota: single cell organisms (the bacteria); once divided into the Archaebacteria and Eubacteria.
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Origin of bacteria

From New Latin bacteria, plural of bacterium, from Ancient Greek βακτήριον (baktērion), neuter diminutive of βακτηρία (baktēria, “rod, stick”).