Sinuses are air-filled spaces in the skull that are connected to the nasal passages by small openings. They are important for humidifying and filtering the air we breathe, as well as providing resonance for our voice. Synonyms for the word "sinuses" include nasal cavities, air pockets, mucosal folds, and paranasal sinuses. These terms are often used interchangeably in medical and layman's language when referring to the sinuses. Understanding synonyms for this term can be helpful in discussions with healthcare providers and in reading medical literature. If you are experiencing symptoms related to your sinuses, such as congestion or pressure, it is important to seek medical attention to determine the underlying cause and receive appropriate treatment.