greenroom definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a waiting room in some theaters or concert halls, for use by actors or musicians when they are offstage
greenroom definition by American Heritage Dictionary
A waiting room or lounge for the use of performers when they are offstage, as in a theater or concert hall.
Origin: So called because such rooms were originally painted green.