| adenovirus | (noun) any of a group of viruses including those that in humans cause upper respiratory infections or infectious pinkeye | - |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arbovirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arborvirus |
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| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| bunyavirus | (noun) an animal virus belonging to the family Bunyaviridae; can be used as a bioweapon | - |
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| coronavirus | (noun) a viral disease caused by SARS-CoV-2 that caused a global pandemic in 2020 | Synonyms: 2019-nCoV acute respiratory disease, corona, coronavirus disease 2019, COVID-19, novel coronavirus pneumonia, Wuhan coronavirus, Wuhan flu, Wuhan pneumonia, Wuhan virus |
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| coxsackievirus | (noun) enterovirus causing a disease resembling poliomyelitis but without paralysis | Synonyms: Coxsackie virus |
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| cytomegalovirus | (noun) any of a group of herpes viruses that enlarge epithelial cells and can cause birth defects; can affect humans with impaired immunological systems | Synonyms: CMV |
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| deinocheirus | (noun) lightly built medium-sized theropod with long limbs and neck | - |
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| echovirus | (noun) any of a group of viruses associated with various diseases including viral meningitis and mild respiratory disorders and diarrhea in newborn infants | - |
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| enterovirus | (noun) any of a group of picornaviruses that infect the gastrointestinal tract and can spread to other areas (especially the nervous system) | - |
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| filovirus | (noun) animal viruses belonging to the family Filoviridae | - |
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| flavivirus | (noun) animal viruses belonging to the family Flaviviridae | - |
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| hepadnavirus | (noun) a group of animal DNA viruses including viruses of ducks and woodchucks and squirrels and others as well as the virus causing hepatitis B in humans | - |
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| lyssavirus | (noun) a neurotropic non-arbovirus of the family Rhabdoviridae that causes rabies | - |
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| myxovirus | (noun) any of a group of RNA viruses including those that cause influenza and mumps | - |
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| orthomyxovirus | (noun) a group of viruses including those causing influenza | - |
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| papovavirus | (noun) any of a group of animal viruses associated with or causing papillomas or polyomas | - |
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| paramyxovirus | (noun) a group of viruses including those causing mumps and measles | - |
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| parvovirus | (noun) any of a group of viruses containing DNA in an icosahedral protein shell and causing disease in dogs and cattle; not known to be associated with any human disease | Synonyms: parvo |
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| picornavirus | (noun) a group of single-strand RNA viruses with a protein coat | - |
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| poliovirus | (noun) the virus causing poliomyelitis | - |
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| poxvirus | (noun) any of a group of viruses that can cause pox diseases in vertebrates | - |
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| provirus | (noun) cDNA copy of the RNA genome of a retrovirus; the genetic material of a virus as incorporated into and able to replicate with the genome of a host cell | - |
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| reovirus | (noun) any of a group of non-arboviruses including the rotavirus causing infant enteritis | - |
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| retrovirus | (noun) any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell | - |
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| rhabdovirus | (noun) any of a group of arboviruses including those causing rabies | - |
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| rhinovirus | (noun) any of a group of picornaviruses that are responsible for many upper respiratory infections | - |
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| rotavirus | (noun) the reovirus causing infant enteritis | - |
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| vesiculovirus | (noun) an animal virus that causes vesicular stomatitis | - |
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| virus | (noun) (virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein | - |
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| (noun) a software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer | Synonyms: computer virus |
| (noun) a harmful or corrupting agency | - |