This dictionary from MedlinePlus and Merriam-Webster provides definitions for medical terms and some entries include an audio clip of the pronounciation.
This tutorial from the National Library of Medicine reviews how to break down and understand medical terms and includes quizzes to test your new knowledge.
The A.D.A.M. Medical Encyclopedia includes over 4,000 articles about diseases, tests, symptoms, injuries, and surgeries. It also contains an extensive library of medical photographs and illustrations.
This site from the American Academy of Family Physicians includes information about medical conditions, suggestions for healthy living and taking charge of your health care, and many other resources.
Includes links to information on over 1600 health topics, personal health tools such as calculators, health news, and how to find a health care provider.
In addition to providing information about diseases and conditions and maintaining a healthy lifestyle, this site also includes interactive tools and an Ask the Expert feature.