I would like to know if there’s a Latin to Latin Dictionary available. I’m much impressed by the Lingua Latina’s explanatary notes, and I’m wondering there’s indeed a Latin-Latin Dictionary already been published before.
http://www.uni-mannheim.de/mateo/camenaref/ducange.html
or http://www.archive.org/search.php?query=glossarium for Du Cange
A number exist published before the 17th century (some available in Early English Books Online: http://eebo.chadwyck.com/home).
Sunt alia dictionaria ante saeculum septimum decimum prodita (et per EEBO inveniantur).
Thanks, Adrianus. That link is super-neat. I’d been wondering the same thing myself over the last week or two, since I think that when I look up words, it would help if it was Latin-to-Latin. Unfortunately, the DuCange glossary probably isn’t for me. It isn’t easily searchable nor does it seem to be complete (e.g. puella, pudendus, largiri are missing or are not defined). Also, looks like some definitions require the reader to have a good grounding in ancient Greek. Of course, the real problem is probably me since I really don’t know Latin well enough yet.
Don’t forget about this (as I did), Victionarium:
Noli hoc negligere (sicut ego):
http://la.wiktionary.org/w/index.php?title=Categoria:Lingua_Latina&from=A
non minùs Dictionarium Johannis de Garlandia (qui Dictionarii nomen finxit, ut credo):
http://www.uni-giessen.de/gloning/at/john-de-garlande_1981-rubin_dictionarius.pdf
hi, you can also have a look at this previous thread on latin to latin dictionaries:
http://discourse.textkit.com/t/latin-latin-dictionary/7800/1
cheers, chad 
Wow! John Garland’s dictionary looks like it would make a great reader!
Thanks for the link.