Virus definitions online

Word lovers! Save words plus keep track of all your lookups. Get Word of the Day in your inbox! Top Lookups Right Now. Unusual Lookup Trends in the Past 24 Hours. See More Games ». Latest Name that Thing: Dog Breeds. Name That Thing. Challenging Words You Should Know. Advanced Vocabulary Quiz. From the Editors. See More ». So they must have a living cell in order to survive and replicate.

Antibiotics are not effective against viruses, but vaccines are, as well as some antivirals. Bettie J. Graham, Ph. Featured Content. Introduction to Genomics. They share many similarities, but also many differences! Learning these differences can be vital to your health. Everyone is talking about testing for antibodies against COVID, so we've created a primer on antibodies and immunity, and their relation to viruses.

Words related to virus ailment , disease , germ , illness , infection , microbe , microorganism , pathogen , sickness , bacillus. How to use virus in a sentence By September 10, there was a 44 percent increase in the proportion of people over age 75 who have been diagnosed with the virus compared to the previous week. Synthetic biologists have created a slow-growing version of the coronavirus to give as a vaccine David Rotman September 16, MIT Technology Review. Lung cell images show how intense a coronavirus infection can be Jonathan Lambert September 15, Science News.

The Boys of '61 Charles Carleton Coffin. Islands of Space John W Campbell. Derived forms of virus virus-like , adjective. Any of a large group of submicroscopic agents that act as parasites and consist of a segment of DNA or RNA surrounded by a coat of protein. Because viruses are unable to replicate without a host cell, they are not considered living organisms in conventional taxonomic systems.

A disease caused by a virus. Genus of viruses: Influenzavirus. Published by Houghton Mifflin Company. Plural viruses. Any of various extremely small, often disease-causing agents consisting of a particle the virion , containing a segment of RNA or DNA within a protein coat known as a capsid. Viruses are not technically considered living organisms because they are devoid of biological processes such as metabolism and respiration and cannot reproduce on their own but require a living cell of a plant, animal, or bacterium to make more viruses.

Viruses reproduce first either by injecting their genetic material into the host cell or by fully entering the cell and shedding their protein coat. The genetic material may then be incorporated into the cell's own genome or remain in the cytoplasm. Eventually the viral genes instruct the cell to produce new viruses, which often cause the cell to die upon their exit.

Rather than being primordial forms of life, viruses probably evolved from rogue pieces of cellular nucleic acids. The common cold, influenza, chickenpox, smallpox, measles, mumps, yellow fever, hemorrhagic fevers, and some cancers are among the diseases caused by viruses. Computer Science A computer program that duplicates itself in a manner that is harmful to normal computer use.