en·ter·i·tis (?n?t?-r??t?s)n. Inflammation of the intestinal tract, especially of the small intestine.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.enteritis (??nt??ra?t?s) n (Pathology) inflammation of the small intestineCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014en?ter?i?tis (??n t??ra? t?s) n. 1. inflammation of the intestines, esp. the small intestine. 2. distemper 1 (def. 1c). [1800?10;