| the aperture of a wind instrument into which the player blows directly | a breathing device for administering long-term artificial respiration |
| the tube of a pipe or cigarette holder that a smoker holds in the mouth | a protective mask with a filter; protects the face and lungs against poisonous gases |
| an acoustic device; the part of a telephone into which a person speaks | |
| (especially boxing) equipment that protects an athlete's mouth | |
| a part that goes over or into the mouth of a person | |
| a spokesperson (as a lawyer) | |