Paranasal is a term that refers to the group of four paired air-filled cavities around the nose and nasal passages. These cavities connect to the nasal cavity and serve different functions such as filtering dust particles, warming and humidifying incoming air, and producing mucus. There are many synonyms for paranasal, including sinusoidal, sinus, nasal-cavity-adjacent, perinasal, perinasal-cavity, and nasal pouches. These synonyms are commonly used in medical contexts to describe the anatomy of the nasal cavity and its surrounding structures and are helpful for clinicians and medical professionals in communicating and understanding the various aspects of nasal health.