green-room

Noun

green room (plural green rooms)

1. In a television studio, theatre or concert hall, the room where performers await their entrance.
   • There are three smaller rooms he can use as rehearsal space or dressing rooms or green rooms, according to need.2016, Margaret Atwood, Hag-Seed, Chapter 12, page 80

   Synonyms:

   tiring-house, tiring-room

2. The inside of a tube (a cylindrical wave).
   • Never quite got covered up, but stood in the doorway to the green room with the lip feathering over my shoulders several times1996, Surfer Bob, archived from the original on 30 Dec 2005