1) Myxovirus 
(from the article `virus`) ...in envelope give crownlike (coronal) appearance. Viruses of this family are important agents of gastrointestinal disease in humans, poultry, and ... Influenza is caused by any of several strains of orthomyxoviruses, categorized as types A, B, and C. The three major types generally produce similar ... [2 ...
(or″tho-mik´so-vi″rәs) any virus of the family Orthomyxoviridae.
[n] - a group of viruses including those causing influenza
orthomyxovirus Any of the family of viruses including the viruses of influenza.
noun a group of viruses including those causing influenza