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Definition of Alphavirus
1. Noun. An arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses.
Medical Definition of Alphavirus
1. A genus of togaviridae, also known as group a arboviruses, serologically related to each other but not to other togaviridae. The viruses are transmitted by mosquitoes. The type species is the sindbis virus. (12 Dec 1998)