Other
Tct Webstage: Theater Glossary
TCTWebstage.com offers a theater terms glossary. While admittedly not an exhaustive list, you'll find explanations of most common terms, from Above to Youth Theater.
Other
Learn the Lingo
This site offers definitions to various stage terms. It also contains word that the director may use and superstitions common to the theatre. It is a informational site for someone who has a question about what certain words mean.
Curated OER
Theatrecrafts.com Glossary of Technical Theatre Terms
Scroll toward the bottom of the page for a definition of the word "tormentors" as it applies to theatre vocabulary.