Definitions from Wiktionary ( )

▸ noun:  A submicroscopic, non-cellular structure consisting of a core of DNA or RNA surrounded by a protein coat, that requires a living host cell to replicate, and often causes disease in the host organism; such agents are often classed as nonliving infectious particles and less often as microorganisms.
▸ noun:  (uncountable) A quantity of such infectious agents
▸ noun:  (informal, metonymically) A disease caused by such an infectious agent; a viral illness.
▸ noun:  (archaic) Venom, as produced by a poisonous animal etc.
▸ noun:  (computing) A type of malware which can covertly transmit itself between computers via networks (especially the Internet) or removable storage such as disks, often causing damage to systems and data; also computer virus.
▸ noun:  (computing, proscribed) Any type of malware.
▸ noun:  (figurative) Any malicious or dangerous entity that spreads from one place or person to another.
▸ verb:  (nonstandard, rare) To send or infect an electronic device with a computer virus.

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