Medline Plus Medical Encyclopedia - 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. https://medlineplus.gov/encyclopedia.html
Medical Terminology Flash Card Game - Flashcard Stash is built on top of a dictionary and contains over 200,000 English words and phrases. This helps when creating vocabulary flashcards by allowing you to select existing definitions. http://flashcardstash.com/lists/7743-medical-terminology-list/games/match
Medical Dictionary of Health Terms - https://www.health.harvard.edu/a-through-c