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Influenzavirus

(ĭn′flōō-ĕnzə-vī′rəs)
n.
  1. A genus of the Orthomyxoviridae family, including the viruses that cause influenza A and B; each type has a stable nucleoprotein group antigen common to all strains of the type, but distinct from that of the other type.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.