animal virus ani·mal·vi·rus uncommon noun 1. an animal pathogen that is a virus Synonymsanimal virus Related words Broader terms virus Narrower terms adenovirusarenavirusbunyavirusfilovirusalphavirusflavivirusvesiculoviruspoxvirus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.