vitamin D deficiency (EFO_0003762) is a nutritional condition produced by a deficiency of VITAMIN D in the diet, insufficient production of vitamin D in the skin, inadequate absorption of vitamin D from the diet, or abnormal conversion of vitamin D to its bioactive metabolites. It is manifested clinically as RICKETS in children and OSTEOMALACIA in adults. (From Cecil Textbook of Medicine, 19th ed, p1406). Also known as: Avitaminosis D, Avitaminosis D, NOS, DEFIC VITAMIN D, Deficiencies, Vitamin D, Deficiency, Vitamin D, VITAMIN D DEFIC, Vitamin D Deficiencies, Vitamin D deficiency (disorder).