Virus Definition

Virus definition is any of a large group of submicroscopic infectious agents that are usually regarded as nonliving extremely complex molecules that typically contain a protein coat surrounding an rna or dna core of genetic material but no semipermeable membrane that are capable of growth and multiplication only in living cells and that cause various important diseases in humans animals and plants. The name is from a latin word meaning slimy liquid or poison.

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A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism.

Virus definition. Any member of a unique class of infectious agents which were originally distinguished by their smallness hence they were described as filtrable because of their ability to pass through fine ceramic filters that blocked all cells including bacteria and their inability to replicate outside of and without assistance of a living host cell. Virus infectious agent of small size and simple composition that can multiply only in living cells of animals plants or bacteria. Viruses infect all types of life forms from animals and plants to microorganisms including bacteria and archaea.

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