What is the meaning of polyhedral virus?

Polyhedral viruses consist of nucleic acid surrounded by a polyhedral (many-sided) shell or capsid, usually in the form of an icosahedron. A virus disease may be defined as a disorder caused by an ultramicroscopic agent which cannot be propagated outside a living cell. Adenovirus is an example of a polyhedral virus. Adenoviruses are nonenveloped viruses with an icosahedral nucleocapsid which surrounds the double-stranded DNA genome.

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