Online dictionaries, glossaries of useful terms, etc

Dictionary of old occupations: useful for comparison when you can’t make out the word, as well as for definitions.
Glossary of old medical terms: Rootsweb
Glossary of 18th and 19th century medical terms:
Dictionary of Traded Good and Commodities 1550-1820: Originally published by University of Wolverhampton, Wolverhampton, 2007. This link is to British History Online website.
Glossary of Latin terms used in genealogy:
Timeline of Victorian legislation: The Victorian Web