operating theatre BrE
surgery AmE ***
operating room AmE

In the operating room you can only see my eyes.

I went to the operating room we had used last night.

They race to the operating room and go into action.

The operating room for the hospital was on the second floor.

They would have an operating room set up and standing by.

"They spent hours on him in the operating room, and now he's going to live."

Finally, I went back into the operating room to clean up.

I will allow you in the operating room on three conditions.

Once you got through there, it would look like an operating room.

Mustn't he be in the operating room by this stage?