operating room
OR
operating theater
operating theatre
surgery ***

Once again she was aware of the sounds in the operating theatre.

I do not remember what, if anything, happened in the operating theater.

He had been in the operating theatre two and a half hours.

The family had converted a small reading room into an operating theater.

There was a hospital on board but no operating theatre.

In 1907 the first major addition to the hospital was a small operating theatre.

A few steps more, and the operating theater was behind him.

He had complained every step of the way from his room to the operating theater.

The nurse looked after him for a moment and went on into the operating theater.

In the operating theater he was always a model of cool efficiency.