virus

A virus is an extremely tiny parasite that can only reproduce if it is within a living being, or anything that corrupts something else. (noun)

An example of a virus is HIV.
An example of a virus is a set of harmful instructions which is placed on a computer to disrupt the operation of the computer.

See virus in Webster's New World College Dictionary

noun

Obsolete venom, as of a snake
1. any of a kingdom (Virus) of prokaryotes, usually ultramicroscopic, that consist of nucleic acid, either RNA or DNA, within a case of protein: they infect animals, plants, and bacteria and reproduce only within living cells: viruses are considered as being either living organisms or inert chemicals
2. a disease caused by a virus
anything that corrupts or poisons the mind or character; evil or harmful influence
an unauthorized, disruptive set of instructions placed in a computer program, that leaves copies of itself in other programs and disks

See virus in American Heritage Dictionary 4

(vīˈrəs)

noun pl. vi·rus·es

a. Any of various simple submicroscopic parasites of plants, animals, and bacteria that often cause disease and that consist essentially of a core of RNA or DNA surrounded by a protein coat. Unable to replicate without a host cell, viruses are typically not considered living organisms.
b. A disease caused by a virus.
Something that poisons one's soul or mind: the pernicious virus of racism.
Computer Science A computer virus.

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