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bacterium – Full Definition

metabolism - Full Definition
bacterium – /bakˈtɪərɪəm/ – noun – [ Biology ]
plural noun: bacteria
– a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some which can cause disease.
biology : any of a domain (Bacteria) (see domain sense 8) of chiefly round, spiral, or rod-shaped single-celled prokaryotic microorganisms that typically live in soil, water, organic matter, or the bodies of plants and animals, that make their own food especially from sunlight or are saprophytic or parasitic, are often motile by means of flagella, reproduce especially by binary fission, and include many important pathogens broadly : prokaryote
Note: Bacteria lack a nuclear membrane or membrane-bound organelles and are categorized as gram-positive or gram-negative when a cell wall is present. While many bacteria are aerobic requiring the presence of oxygen to survive, others are anaerobic and are able to survive only in the absence of oxygen.
— compare archaea, eukaryote

Examples of bacterium in a Sentence
“The bacterium is resistant to extreme hot and extreme cold situations.” Ryan Prior, CNN, “Several products from Trader Joe’s are being recalled over possible listeria contamination,” 4 Dec. 2019
“Another bacterium closely linked to antibiotic use is C. diff.” Anchorage Daily News, “Deadly superbugs pose greater threat than previously estimated,” 13 Nov. 2019
SourceMerriam Webster
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