Green room

[4][verification needed] A later renovation of London's Cockpit-in-Court theatre in 1662 included a green baize dressing room, which has also been suggested as the origin of the term.

[8] Richard Southern, in his studies of medieval theatre in the round, states that in this period the acting area was referred to as 'the green'.

As a person who feels nauseous is often said to look "green", suggesting that the 'green room' is the place where the nervous actors wait.

Rhyming slang can be traced only as early as the 1840s, whereas the phrase "green room" predates this by several centuries, making such an etymology unlikely.

This green plot shall be our stage, this hawthorn-brake our tiring-house; and we will do it in action as we will do it before the duke.Samuel Pepys mentions these locations at the Drury Lane Theatre Royal in 1667: ...she took us up into the Tireing-rooms and to the women's Shift, where Nell was dressing herself and...then below into the Scene-room, and...here I read the Qu's (cues) to Knepp while she answered me, through all her part of Flora's Figarys...

Salón Verde ("Green Hall"), a green room at the Teatro Real in Madrid , Spain. The chairs, curtains and walls are predominantly green.
The green room at the Traverse Theatre , Edinburgh