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- DictionaryBac·te·ri·um/bakˈtirēəm/
noun
- 1. a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some that can cause disease.
The meaning of BACTERIA is bacterium. How to use bacteria in a sentence. Is bacteria singular or plural?: Usage Guide
Bacteria (/ b æ k ˈ t ɪər i ə / ⓘ; sg.: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats.
a type of very small organism that lives in air, earth, water, plants, and animals, often one that causes disease: an illness caused by bacteria in drinking water. The bacterium Streptococcus pneumoniae causes about a third of some 3,000 annual meningitis cases.
5 days ago · Bacteria, microscopic single-celled organisms that inhabit virtually all environments on Earth, including the bodies of multicellular animals. Bacteria lack a membrane-bound nucleus and other internal structures. Learn about the features, types, and significance of bacteria.
Oct 4, 2019 · Bacteria Definition Bacteria are single-celled microorganisms with prokaryotic cells, which are single cells that do not have organelles or a true nucleus and are less complex than eukaryotic cells. Bacteria with a capital B refers to the domain Bacteria, one of the three domains of life.
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.
BACTERIUM meaning: any one of a group of very small living things that often cause disease usually plural.
