greenrooms

/G R IY1 N R UW0 M Z/
noun
  1. 1

    In a television studio, theatre or concert hall, the room where performers await their entrance.

  2. 2

    The inside of a tube (i.e. of a wave making a tube).

Source: https://en.wiktionary.org/wiki/green%20room, https://en.wiktionary.org/wiki/greenroom, https://en.wiktionary.org/wiki/greenrooms