You should try reading The Ballet Companion by Eliza Gaynor Minden. It has information on ballet's history, a glossary of terms, and lots of useful information on everything from doing a bun to auditioning and performing. What I expect would help the most, however, are the sections written on ballet movements like tendues, grande battements, and pirouettes. They have lots of pictures and give you really informative tips for each ballet movement!

the glossary contains

Theosophical Glossary was created in 1892.

The plural form of glossary is glossaries.

A glossary is a list of word meanings.