Definition of Virus:

  1. A piece of code which is capable of copying itself and typically has a detrimental effect, such as corrupting the system or destroying data.

  2. See computer virus.

  3. An infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.

  4. Infectious and parasitic microorganism much smaller than a bacterium, too small to be seen with a regular microscope or to be trapped even by ceramic filters. A virus is incapable of independent metabolic activity and replication, it must invade a live animal, human, or plant cell from which to derive the energy for survival. For replication, the virus provides only the genetic code and the invaded cell provides the raw material. The growth of viruses disrupts the invaded cells internal mechanism and it usually dies and releases the viruses in the bloodstream. The invaded bodys immune defenses react by producing an antiviral protein (interferon) which halts the spread of viruses to other cells. These defenses, however, sometimes are incapable of resisting the virus and are overwhelmed resulting in a diseased body. Antibiotics are ineffective against viruses and special types of drugs called vaccines (suspensions of attenuated or killed viruses) have to be developed for each type of virus. Out of some 5000 known species of viruses, over 200 have been identified as disease causing (pathogenic) to humans. New ones, like AIDS (Acquired Immune Deficiency Syndrome) in 1983 and SARS (Severe Acute Respiratory Syndrome) in 2003, appear suddenly and are often of animal origin. Some other common human diseases caused by viruses are chickenpox, common cold, herpes, influenza, mumps, measles, polio, rabies, rubella, and yellow fever. In 1971, microorganism smaller than viruses (called viroids) were discovered which can cause some rare diseases. In 1982, US neurologist Stanley Pruisner indicated the presence of a particle (called prion) about 1/100th the size of a virus and responsible for Bovine Spongiform Encephalopathy (BSE) and variant Creutzfeldt-Jakob Disease (vCJD) (see mad cow disease for details), for which he won the year 2000 Nobel Prize for physiology.

Synonyms of Virus

Acaricide, Adenovirus, Aerial infection, Aerobe, Aerobic bacteria, Aerobic organism, Airborne infection, Amoeba, Anaerobe, Anaerobic bacteria, Anaerobic organism, Anthelmintic, Antibiotic, Antiseptic, Autotrophic organism, Bacillus, Bacteria, Bacterium, Bane, Being, Bug, Bug bomb, Carbamate insecticide, Carrier, Chemosterilant, Chlorinated hydrocarbon insecticide, Coccus, Communicability, Contact poison, Contagion, Contagiousness, Contamination, Corruption, Creature, Cryptogenic infection, Defoliant, Direct infection, Disease-producing microorganism, Disinfectant, Droplet infection, Dust infection, Echovirus, Enterovirus, Epidemiology, Eradicant, Filterable virus, Fumigant, Fungicide, Fungus, Genetic individual, Germ, Germicide, Gram-negative bacteria, Gram-positive bacteria, Hand infection, Herbicide, Heterotrophic organism, Indirect infection, Individual, Infection, Infectiousness, Insect powder, Insecticide, Living being, Living thing, Microbe, Microbicide, Microorganism, Miticide, Mold, Morphological individual, Nonfilterable virus, Ont, Organic being, Organic chlorine, Organic phosphate insecticide, Organism, Organization, Pathogen, Pesticide, Physiological individual, Phytogenic infection, Picornavirus, Poison, Primary infection, Protozoa, Protozoon, Pyogenic infection, Rat poison, Reovirus, Rhinovirus, Rickettsia, Roach paste, Roach powder, Rodenticide, Secondary infection, Spirillum, Spirochete, Spore, Staphylococcus, Stomach poison, Streptococcus, Subclinical infection, Systemic, Systemic insecticide, Taint, Toxic, Toxicant, Toxin, Trypanosome, Vector, Venin, Venom, Vermicide, Vibrio, Waterborne infection, Weed killer, Zoogenic infection, Zooid, Zoon

How to use Virus in a sentence?

  1. When the virus began no one was safe, it spread quickly throughout the entire town, infecting everyone in its path.
  2. A computer virus or spyware application is sending us automated requests, and it appears that your computer or network has been infected.
  3. A virus infection.
  4. Unfortunately, there was no more treatment options available for Bill because the virus had taken over his heart cells and soon his heart cells would be infected and would die.
  5. After going to the doctor and explaining my symptoms, like vomiting and a high fever, he concluded that I was sick with the flu virus .

Meaning of Virus & Virus Definition