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Definitions of bacterium

  1. single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered plants Scrapingweb Dictionary DB
  2. (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered plants Wordnet Dictionary DB
  3. A microscopic vegetable organism, belonging to the class Algae, usually in the form of a jointed rodlike filament, and found in putrefying organic infusions. Bacteria are destitute of chlorophyll, and are the smallest of microscopic organisms. They are very widely diffused in nature, and multiply with marvelous rapidity, both by fission and by spores. Certain species are active agents in fermentation, while others appear to be the cause of certain infectious diseases. See Bacillus. Webster Dictionary DB
  4. Any unicellular vegetable microorganism, microphyte, especially one of the schizomycetes or fission fungi. A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
  5. A genus of Bacteriaceae, including ellipsoidal or rod-shaped, non-flagellated forms which often unite in zoogloea masses. A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
  6. Rod-shaped microorganism. Warner's pocket medical dictionary of today. By William R. Warner. Published 1898.
  7. A microscopic organism; microbe. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
  8. Bacterial. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
  9. A microscopic single-celled organism having no distinguishable nucleus, belonging to the kingdom Monera. Bacteria have varying shapes, usually taking the form of a jointed rodlike filament, or a small sphere, but also in certain cases having a branched form. Bacteria are destitute of chlorophyll, but in those members of the phylum Cyanophyta (the blue-green algae) other light-absorbing pigments are present. They are the smallest of microscopic organisms which have their own metabolic processes carried on within cell membranes, viruses being smaller but not capable of living freely. The bacteria are very widely diffused in nature, and multiply with marvelous rapidity, both by fission and by spores. Bacteria may require oxygen for their energy-producing metabolism, and these are called aerobes; or may multiply in the absence of oxygen, these forms being anaerobes. Certain species are active agents in fermentation, while others appear to be the cause of certain infectious diseases. The branch of science with studies bacteria is bacteriology, being a division of microbiology. See Bacillus. dictgcide_fs
  10. bak-t[=e]'ri-um, n., BACTERIA, bak-t[=e]'ri-a, n.pl. Schizomycetes, extremely small, single-celled, fungoid plants, single or grouped, reproducing rapidly by cross division or by the formation of spores, almost always associated with the decomposition of albuminoid substances, and regarded as the germs or active cause of many diseases.--ns. BACTERIOL'OGIST; BACTERIOL'OGY, the scientific study of bacteria. [Gr. bakt[=e]rion, dim. of baktron, stick, staff.] gutenberg.org/ebooks/37683
  11. [Greek] A genus of Schizomycetes comprising the short, straight rod forms; by some restricted to the non-sporiferous, by others to the non-flagellate forms. na
  12. Genus of schizomycetae, microscopic rod-shaped unicellular organisms in decomposing liquids. Hence bacterial a., bacteriology, -OLOGIST, nn. [Latin] Concise Oxford Dictionary
  13. Pl. bacteria. A genus of schizomycetes of short, rod like form. American pocket medical dictionary.
  14. pl., ia. A genus of microscopic fungi belonging to the class Schizomycetes, order Bacteriaceae. It includes all the forms with straight, inflexible, linear body and without flagella. Migula's classification into families is: Coccaceae, Bacteriaceae, Spirillaceae, Chlamydobacteriaceae, Beggiatoaceae. The so-called non-motile bacilli, such as B. anthracis, according to the classification of Migula, should each be called "bacterium", as B. anthracis. [Gr.] Appleton's medical dictionary.

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