‘鼻咽’ (bí yān) is a medical anatomical term referring to the nasopharynx—the upper part of the pharynx located behind the nose and above the soft palate. It serves as a shared passageway for both air and mucus, connecting the nasal cavity to the rest of the respiratory tract. The character 鼻 means 'nose' and 咽 means 'pharynx' or 'throat'; together, they literally denote 'nose-throat', precisely capturing its anatomical position and function.

This term is used almost exclusively in clinical, biomedical, or health-related contexts—such as discussions of infections (e.g., nasopharyngitis), cancers (e.g., nasopharyngeal carcinoma), or diagnostic procedures like nasopharyngoscopy. It rarely appears in everyday conversation and is not used metaphorically. Learners should recognize it as a formal, technical compound noun rather than a general vocabulary item.