The Chinese word 肚脐 (dùqí), meaning "navel" or "belly button," is a compound noun formed by combining two meaningful characters: 肚 (dù), which means "belly" or "abdomen," and 脐 (qí), which specifically means "navel." It follows a common structural pattern in Mandarin where a general category term (肚, the belly) is modified and specified by a more precise term (脐, the navel) to create a clear, concrete concept for a specific body part, functioning essentially as an "endocentric compound" where the second element is the core meaning.