The term '喷嚏反射' (pēn tì fǎn shè) literally means 'sneeze reflex' — a rapid, involuntary physiological response triggered when the nasal mucosa is irritated by dust, allergens, or pathogens. It involves coordinated contraction of respiratory muscles and expulsion of air through the nose and mouth to clear irritants. Each character contributes meaning: '喷' (pēn) means 'to spurt' or 'to expel', '嚏' (tì) specifically means 'sneeze', '反' (fǎn) means 'reverse' or 'rebound', and '射' (shè) means 'to shoot' or 'to emit'. Together, they describe the body's automatic 'shooting back' response to nasal stimulation.

This term is used primarily in medical, biological, or health-related contexts — for example, in discussions of immunity, neurological pathways, or common cold symptoms. Unlike casual terms like '打喷嚏', 喷嚏反射 emphasizes the underlying neural mechanism (involving the trigeminal nerve and brainstem), not just the observable action. It appears in textbooks, clinical reports, and public health education, especially when explaining why sneezing cannot be fully suppressed or how it spreads respiratory viruses.