1. A reference to a Y-shaped instrument that amplifies body sounds; such as, heartbeat, breathing, and air in the intestines mostly applied to the chest.
2. A descriptive term for an instrument consisting of two earpieces connected by means of flexible tubing to a diaphragm, which is placed against the skin of the patient's chest, or back, to hear the heart and lung sounds; and it is also used to hear bowel sounds.