Definitions
1.nounA 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.
2.nounA disease caused by these organisms."He caught a virus and had to stay home from school."
3.nounVenom, as produced by a poisonous animal etc.
4.nounA 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.
5.nounAny type of malware.