infectious hepatitisn. See hepatitis A.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.infectious hepatitis n (Pathology) any form of hepatitis caused by viruses. See hepatitis A, hepatitis B, hepatitis C Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014hepatitis A n. a normally minor form of hepatitis caused by an RNA virus that does not persist in the blood: usu. transmitted by ingestion of contaminated food or water. Also called infectious hepatitis. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.