en·do·car·di·tis (?n?d?-kär-d??t?s)n. Inflammation of the endocardium.[endocard(ium) + -itis.]en?do·car·dit?ic (-d?t??k) adj.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.endocarditis (??nd??k???da?t?s) n (Pathology) inflammation of the endocardium endocarditic adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014en?do?car?di?tis (??n do? k?r?da? t?s) n. inflammation of the endocardium. [1830?40] en`do?car?dit?ic (-?d?t ?k) adj. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.endocarditisan inflamed condition of the endocardium, the membrane that lines heart chambers.See also: Heart-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.endocarditisInflammation of the endocardium (inner heart lining) often resulting from infection by bacteria.Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited