pertaining to or involving the spreading of information and opinions about a product or service from person to person, especially on the Internet or in e-mails:
Meningitis is usually caused by a bacterial or viral infection.
With no funding this is going to be a purely viral marketing affair.
Not enough cells were transplanted in the trial to cure the patients or even reduce their viral load.
Subject to aster yellows, a viral disease carried by leafhoppers.
viral gastroenteritis is inflammation of the stomach and intestines caused by a virus.
Wal-Mart's viral capacities negatively impact communities' businesses and wages.
Having eliminated one viral disease, the authorities decided they ought to be able to get rid of another: polio.
They suffer from malnutrition and various viral and bacterial diseases.
Meningitis is usually caused by a viral or bacterial infection.
And while we're on the topic of uncomfortable travel moments caught on camera, here's another one that's gone viral.
British Dictionary definitions for viral
viral
/ˈvaɪrəl/
adjective
1.
of, relating to, or caused by a virus
2.
(of a video, image, story, etc) spread quickly and widely among internet users via social networking sites, e-mail, etc
Word Origin and History for viral
adj.
"of the nature of, or caused by, a virus," 1948, see virus.
viral in Medicine
viral vi·ral (vī'rəl) adj. Of, relating to, or caused by a virus.
viral in Science
virus
(vī'rəs) Pluralviruses
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. Most viruses work by attaching themselves to another program. The amount of damage varies; viruses may erase all data or do nothing but reproduce themselves.