niddm n mild form of diabetes mellitus that develops gradually in adults; can be precipitated by obesity or severe stress or menopause or other factors; can usually be controlled by diet and hypoglycemic agents without injections of insulin Synonym(s) type II diabetes non-insulin-dependent diabetes mellitus NIDDM non-insulin-dependent diabetes ketosis-resistant diabetes mellitus ketosis-resistant diabetes ketoacidosis-resistant diabetes mellitus ketoacidosis-resistant diabetes adult-onset diabetes mellitus adult-onset diabetes maturity-onset diabetes mellitus maturity-onset diabetes mature-onset diabetes