para-influenza virusn1. (Pathology) any of a group of viruses that cause respiratory infections with influenza-like symptoms, esp in childrenCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014