The nasal opening is an important part of the human body responsible for breathing. There are several words that are used to refer to this part of the body. One of the most common synonyms is nostril. Nostril refers to either one of the two external openings of the nasal cavity, through which we inhale and exhale air. Another term for nasal opening is naris, this is a medical term that describes the external or internal openings of the nasal cavity. Other terms, less commonly used, include narial passage, nasal cavity or nasal vestibule. It is important to refer to the nasal opening by its correct name to avoid confusion.