Dictionary Meaning and Definition on 'Organism'
- a living thing that has (or can develop) the ability to act or function independently [syn: being]
- a system considered analogous in structure or function to a living body; "the social organism"
- Organism \Or"gan*ism\, n. [Cf. F. organisme.]
- Organic structure; organization. ``The advantageous organism of the eye.'' --Grew.
- (Biol.) An organized being; a living body, either vegetable or animal, compozed of different organs or parts with functions which are separate, but mutually dependent, and essential to the life of the individual. Note: Some of the lower forms of life are so simple in structure as to be without organs, but are still called organisms, since they have different parts analogous in functions to the organs of higher plants and animals.
Wikipedia Meaning and Definition on 'Organism'
In biology, an organism is any contiguous living system (such as animal, plant, fungus, or micro-organism). In at least some form, all organisms are capable of response to stimuli, reproduction, growth and development, and maintenance of homoeostasis as a stable whole. An organism may either be unicellular (single-celled) or be composed of, as in humans, many trillions of cells grouped into specialized tissues and organs. The term multicellular (many-celled) describes any organism made up of more than one cell.
The term "organism" (Greek ὀργανισμός – organismos, from Ancient Greek ὄργανον – organon "organ, instrument, tool") first appeared in the English language in 1701 and took on its current definition by 1834 (Oxford English Dictionary).
Scientific classification in biology considers organisms synonymous with "life on Earth". Based on cell type, organisms may be divided into the prokaryotic and eukaryotic groups. The prokaryotes represent two separate domains, the Bacteria and Archaea. Eukaryotic organisms, with a membrane-bounded cell nucleus, also contain organelles, namely mitochondria and (in plants) plastids, generally considered to be derived from endosymbiotic bacteria. Fungi, animals and plants are examples of species that are eukaryotes.[See more about Organism at Dictionary 3.0 Encyclopedia]
Words and phrases related to 'Organism'
'Organism' in famous quotation sentence
* Jean Grey Mutation. It is the key to our evolution. It has enabled us to evolve from a single-celled organism into the dominant species on the planet. This process is slow and normally taking thousands and thousands of years. But every few hundred millennia, evolution leaps forward. - X2 X-Men United
* All progress is based upon a universal innate desire on the part of every organism to live beyond its income. - Samuel Butler
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Organism Sample Sentences in News
- Parasites: How they affect health
THE “Merck Manual of Medical Information” defines a parasite as an organism, such as a single-celled animal (protozoan) or worm that survives by living inside another, usually much larger, organism or host. Simply put, a parasite benefits at the expense of another, which is the host. Read more on this news related to 'Organism'
- Your Cat's Poop Could One Day Treat Cancer
A microscopic organism that lives in cat poop could one day be used as a cancer treatment, researchers say. Toxoplasma gondii is a single-celled parasite that lives in cats' intestines, but can infect other animals and people as well. Now, researchers are aiming to harness the immune response triggered by the parasite and direct it to attacking tumors. "W Read more on this news related to 'Organism'
- Key molecule in flies identified that adjusts energy use under starvation conditions
In the fly Drosophila melanogaster, p53 is activated in certain cells to adapt the metabolic response to nutrient deprivation, thus having a global effect on the organism, researchers show. The researchers also reveal the molecular mechanisms through which the activity of p53 is regulated. The results obtained in Drosophila are useful to address the study of the m Read more on this news related to 'Organism'