Glossarium Philosophicum:

Glossarium Philosophicum is a lexicon of terms in Latin used by philosophers. There is an alphabetical list in English through which you can search for the philosophical term in Latin. There is also an index of abbreviations.

Perseus Dictionary:

Perseus provides a form for inserting words in Latin or Greek. There is a Greek alphabet for selection or you may use Latin transliteration.


Thesaurus Musicarum Latinarum:

Thesaurus Musicarum Latinarum is a database of Medieval and Renaisssance Latin musical theory. You may search musical terms by century.

Online Etymological Dictionary:

Online Etymological Dictionary has an A-Z and a comprehensive set of English words with explanations of their etymologies, many of which are from the Latin by way of French. This is an excellent place to spend idle moments learning new words.

Dictionary of Greek & Latin Roots:

Dictionary of Greek & Latin Roots is a printable page with a few dozen Greek and Latin roots with English words based on these classical roots.