May I suggest the follow link for a well-organized glossary of theatrical terms: http://www.theatrecrafts.com/glossary/glossary.shtml
Here are some excerpts:
LOGE
Seating area in traditional proscenium arch venues. Exact location varies according to the venue, but is usually a "box" position at the dress circle level. (From the French Logè)
GREEN ROOM
Room close to the stage (i.e. the green) for the actors to meet and relax.
GODS
Colloquial term for the Upper Circle of the auditorium.
BLACK BOX
A kind of studio theatre where the audience and actors are in the same room, surrounded by black tabs (curtains). Doesn't necessarily describe the audience layout.
CIRCLE
The balcony with tiered seating above the stalls. Also known as Dress Circle or Grand Circle. See also UPPER CIRCLE.
THRUST
Form of stage which projects into the auditorium so that the audience are seated on at least two sides of the extended piece. See also END ON, IN THE ROUND.
THUNDER RUN
Long channel down which a cannonball is rolled to give a realistic thunder rumble effect. Built into the roof of some older theatres, but mostly now unused (for safety reasons).
UPPER CIRCLE
Highest balcony in the auditorium. Also known as the GODS. Normally has a very steep view down to the stage, and highly raked seating.
