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n. pl. con·ta·gia (-jə)
The causative agent of a communicable disease; contagion.
[Latin contāgium, contagion, contamination, from contāgiō; see contagion.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -gia (-dʒɪə)
(Pathology) pathol the specific virus or other direct cause of any infectious disease
[C17: from Latin, variant of contāgiō contagion]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
con•ta•gium(kənˈteɪ dʒəm, -dʒi əm)
n., pl. -gia (-dʒə, -dʒi ə)
the causative agent of a contagious or infectious disease, as a virus.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.