body dysmorphic disordern. A psychiatric disorder characterized by chronic and obsessive preoccupation with perceived defects in one’s physical appearance that appear minor or are not visible to others and that are not related to fat or body weight.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.body dysmorphic disorder n (Psychology) a psychological disorder characterized by a strong feeling that one’s appearance or health would be improved by the removal of a healthy body part Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014