The Chinese word **膀胱** (pángguāng), meaning "urinary bladder," is a **disyllabic compound noun** formed through semantic combination, where both characters contribute to the meaning of a single anatomical organ. Each character contains the **肉 (flesh/body) radical** (in its variant form ⺼), immediately signaling it as a body part. Historically, **膀** originally referred to the side of the body or ribs, suggesting a broad, enclosing function, while **胱** was specifically used for the bladder itself; when combined, they create a precise, fixed term. This formation exemplifies the common Chinese lexical process where two semantically related, bound morphemes—neither used independently in modern language for this concept—are joined to denote a specific, concrete object within medical and anatomical terminology.