Before revision: upright=1.3|Inside a modern operating room An operating theater (also known as an operating room (OR), operating suite, or operation suite) is a facility within a hospital where surgical operations are carried out in an aseptic environment.
After revision: upright=1.3|Inside a modern operating room An operating theatre (also known as an operating room (OR), operating suite, or operation suite) is a facility within a hospital where surgical operations are carried out in an aseptic environment.