- singular of bacteria.
Origin of bacterium
- ubiquitous one-celled organisms, spherical, spiral, or rod-shaped and appearing singly or in chains, comprising the Schizomycota, a phylum of the kingdom Monera (in some classification systems the plant class Schizomycetes), various species of which are involved in fermentation, putrefaction, infectious diseases, or nitrogen fixation.
Origin of bacteria
Related Wordsmicroorganism, germ, virus, bug, bacterium, bacillus, pathogen, microbe, parasite, egg, unit, disease, plague, antibody, crud, embryo, spore, vacuole, corpuscle, follicle
Examples from the Web for bacterium
Caused by the bacterium Borrelia burgdorferi, the illness is transmitted by the bite of an infected tick.Predator Doctors Take Advantage of Patients With ‘Chronic Lyme’ Scam
September 19, 2014
One type of bacterium is likely very different from its neighbors, and may have equally different effects on the body.Your Probiotic Is Probably B.S.
June 25, 2014
Pertussis, or “whooping cough,” is caused by the bacterium Bordetella pertussis.Thanks to Anti-Vaxxers, Mumps Are Back. What’s Next?
March 20, 2014
The bacterium Neisseria meningitidis causes between 800 and 1,500 cases annually in the U.S., killing many .Princeton Considers Vaccinations for Slow-Moving Meningitis Outbreak
November 18, 2013
Botulism is caused by the bacterium Clostridium botulinum, a hardy anaerobe.The Deadliest Botox Has Arrived
October 18, 2013
Virus or bacterium, amoeba or fungus—whatever it was, it struck.Despoilers of the Golden Empire
Gordon Randall Garrett
The bacterium of splenic fever is called Bacillus Anthracis.
At the end of three days there is not a bacterium to be found in it.
The Bacterium termo (Fig. 30) is the smallest of the Infusoria.
Bacterium, The same, termo (Mller), magnified magnified 600 times.
- the singular of bacteria
- a very large group of microorganisms comprising one of the three domains of living organisms. They are prokaryotic, unicellular, and either free-living in soil or water or parasites of plants or animalsSee also prokaryote
Word Origin and History for bacterium
c.1848, singular of bacteria (q.v.).
1847, plural of Modern Latin bacterium, from Greek bakterion "small staff," diminutive of baktron "stick, rod," from PIE *bak- "staff used for support." So called because the first ones observed were rod-shaped. Introduced as a scientific word 1838 by German naturalist Christian Gottfried Ehrenberg (1795-1876).
- Any of the unicellular, prokaryotic microorganisms of the class Schizomycetes, which vary in terms of morphology, oxygen and nutritional requirements, and motility, and may be free-living, saprophytic, or pathogenic, the latter causing disease in plants or animals.
- Plural ofbacterium
- 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. See also archaeon prokaryote.
Usage: It is important to remember that bacteria is the plural of bacterium, and that saying a bacteria is incorrect. It is correct to say The soil sample contains millions of bacteria, and Tetanus is caused by a bacterium.
- Plural of bacterium.