The term "pneocardiac reflex" refers to a physiological response where stimulation of lung stretch receptors triggers a reflex decrease in heart rate. Although commonly used in medical literature, there are several synonymous terms that can be used interchangeably to describe this reflex. One such alternative is the "Hering-Breuer reflex", named after the physiologists Josef Hering and Ewald Breuer who initially discovered it in the late 19th century. Additionally, it is sometimes referred to as the "pulmonary reflex" due to its association with the lungs. These synonyms help clarify discussions around this reflex and its impact on heart rate regulation and respiratory physiology.