A surgical mask is used inside the operating room or during other sterile procedure areas to protect the patient environment from contamination. Surgical masks have ties so that they can be adjusted for fit, and are tied over the top of a surgical or bouffant cap.
rockfall. 1  an act or instance of the falling of rock, as in a cave-in or an avalanche. 2  a mass of rocks that have fallen: to be trapped under a rockfall.
Definition of pitfall 1: trap, snare; specifically: a pit flimsily covered or camouflaged and used to capture and hold animals or men 2: a hidden or not easily recognized danger or difficulty