computer virus

virus ( def 4 ).

1985–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Cultural Dictionary

computer virus definition

A program that enters a computer usually without the knowledge of the operator. Some viruses are mild and only cause messages to appear on the screen, but others are destructive and can wipe out the computer's memory or cause more severe damage.

Note: Computer viruses spread from machine to machine on disks or, more commonly, over the Internet.
Note: The creation of computer viruses can be part of cyberwarfare.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

computer virus definition


The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The problem with comparing genetic engineering to a computer virus is the
  vastly different degrees of potential effects.
Most people now know the drill when it comes to thwarting a computer virus.
Bear in mind that your typical, run-of-the-mill computer virus is not alive,
  because all it does is replicate itself.
Also, can't help but notice that the image of the virus used on the cover is
  actually a visualization of a computer virus' code.
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