der·ma·ti·tis (dûr?m?-t??t?s)n. Inflammation of the skin.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.dermatitis (?d??m??ta?t?s) n (Pathology) inflammation of the skinCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014der?ma?ti?tis (?d?r m??ta? t?s) n. inflammation of the skin. [1875?80;