parvovirus Syllabification: (par·vo·vi·rus)Pronunciation: /ˈpärvōˌvīrəs/Definition of parvovirus noun Medicine any of a class of very small viruses chiefly affecting animals, especially one ( canine parvovirus) that causes contagious disease in dogs. Origin: 1960s: from Latin parvus 'small' + virusparvovirus in other Oxford dictionaries Definition of parvovirus in the British & World English dictionary