NIDDM abbreviation for (Pathology) noninsulin-dependent diabetes mellitus; a form of diabetes in which insulin production is inadequate or the body becomes resistant to insulin Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014