UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈvaɪərəs/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈvaɪrəs/ ,USA pronunciation: respelling(vīrəs)

Inflections of 'virus' (nnoun: Refers to person, place, thing, quality, etc.): nplplural noun: Noun always used in plural form--for example, "jeans," "scissors.": viruses

WordReference Random House Learner's Dictionary of American English © 2020
vi•rus /ˈvaɪrəs/USA pronunciation   n.[countable]pl.  -rus•es. 
  1. Microbiologya very small living thing causing infection, which reproduces only within the cells of living hosts, mainly bacteria, plants, and animals.
  2. Pathology, Informal Termsa disease caused by a virus:was ill from a virus.
  3. a corrupting idea or thought or a harmful influence on morals or the intellect.
  4. Computinga part of a computer program that is planted illegally in another program, often to damage or shut down a system or network.

WordReference Random House Unabridged Dictionary of American English © 2020
vi•rus  (vīrəs),USA pronunciation n., pl.  -rus•es. 
  1. Microbiologyan ultramicroscopic (20 to 300 nm in diameter), metabolically inert, infectious agent that replicates only within the cells of living hosts, mainly bacteria, plants, and animals: composed of an RNA or DNA core, a protein coat, and, in more complex types, a surrounding envelope.
  2. Pathology, Informal Terms[Informal.]a viral disease.
  3. a corrupting influence on morals or the intellect;
  4. Computinga segment of self-replicating code planted illegally in a computer program, often to damage or shut down a system or network.
vi rus•like′, adj. 
  • Latin vīrus slime, poison; akin to ooze2
  • 1590–1600

Collins Concise English Dictionary © HarperCollins Publishers::
virus /ˈvaɪrəs/ n ( pl -ruses)
  1. any of a group of submicroscopic entities consisting of a single nucleic acid chain surrounded by a protein coat and capable of replication only within the cells of living organisms: many are pathogenic
  2. informal a disease caused by a virus
  3. any corrupting or infecting influence
  4. an unauthorized program that inserts itself into a computer system and then propagates itself to other computers via networks or disks; when activated it interferes with the operation of the computer
Etymology: 16th Century: from Latin: slime, poisonous liquid; related to Old English wāse marsh, Greek ios poison
'virus' also found in these entries:
Collocations: a computer virus, think my [computer, laptop] has a virus, get rid of viruses on your [computer], more...

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