Unfortunately, there is no modern Latino-Latinum dictionary currently in print that I am aware of, although some of these scans below may now be available print-on-demand.
If you know of other Latin-Latin Dictionaries or Lexicons, please drop a note in the comments section.
There are a few other useful dictionaries and lexicons - though most are for 'walled gardens' of vocabulary for specific subject areas or a particular corpus of work.
Gradus ad Parnassum - not strictly a dictionary, but it gives synonyms and antonyms, so often enough detail to work out what a word means, assuming you already have a baseline vocabulary.
Robert Étienne's Thesaurus
Gesner's Novus Thesaurus
Forcellini's Totius Latinitatis Lexicon
Wagner's Lexicon Latinum