Antiquus Morbus is a fascinating web site that provides definitions of archaic medical terms, along with their old and modern definitions. The primary focus of this web site is to help decipher the causes of death found on mortality lists, certificates of death, and church death records from the 19th century and earlier. It often can give insights to understanding your ancestor's life style and last days.
The site is more than a simple dictionary. It not only provides modern-day equivalents of old terminology, but also provides supplemental information on many of the terms found, such as when and where such terminology was found. Many terms include descriptions of the causes of the medical condition. Even better, the web site provides lists of archaic medical terms, diseases, and causes of death in English, German, French and a few other languages.
As an example, on this site you learn that "Gall Sickness" is a popular name for the remitting fever occasioned by marsh miasmata in the Netherlands, which proved so fatal to thousands of the English soldiers after the capture of Walcheren in the year 1809.
This and several thousand more archaic medical terms can be found on Rudy's List of Archaic Medical Terms at http://www.antiquusmorbus.com.