virus

IPA: vˈaɪrʌs

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.
(uncountable) A quantity of such infectious agents
(informal, metonymically) A disease caused by such an infectious agent; a viral illness.
(archaic) Venom, as produced by a poisonous animal etc.
(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.
(computing, proscribed) Any type of malware.
(figurative) Any malicious or dangerous entity that spreads from one place or person to another.

(nonstandard, rare) To send or infect an electronic device with a computer virus.

Examples of "virus" in Sentences

A virus is a tiny infectious agent that can replicate only inside the living cells of an organism
My computer got infected with a virus and now I can't access any of my files
The flu virus is constantly mutating, making it challenging to develop an effective vaccine
She always makes sure to wash her hands frequently to reduce the risk of spreading any viruses
The spread of the virus caused widespread panic and led to strict lockdown measures being implemented