Since its initial publication in 1982, Mosby's Medical, Nursing, and Allied Health Dictionary has become a highly respected and widely used reference in the health sciences, particularly in nursing. The fourth edition was the first English-language medical dictionary to contain four-color illustrations. This popular feature took the market by storm and doubled sales of Mosby's Medical, Nursing, & Allied Health Dictionary. Of the approximately 2,200 illustrations included in the sixth edition, over half are new to this edition. All of the illustrations have been carefully selected to enhance the definitions of a wide variety of medical terms, especially those pertaining to anatomy, equipment, pathophysiology, and skin and eye disorders. The illustrations not only add to the dictionary's visual appeal, but also allow for the illustration of many conditions that cannot effectively be shown in black and white. Other strengths of Mosby's Medical, Nursing, & Allied Health Dictionary include the use of a large, easy-to-read typeface; a practical, strict alphabetical organization with no subentries (a la Webster's); comprehensive definitions for key entries such as major diseases, disorders and procedures; detailed drug entries; the Color Atlas of Human Anatomy; and the variety of practical reference information included in the appendixes. These features are retained in the sixth edition as approximately 3,000 new entries are added, and existing entries are revised to keep pace with current knowledge and practice. Appendixes have been thoroughly revised and updated based on market research, with deletion of a few appendixes that reportedly receive little use.