The word **病史** (bìngshǐ), meaning "medical history" or "case history," is a compound noun formed through the common Chinese method of combining two meaningful characters (morphemes). The first character, **病** (bìng), means "illness" or "disease," and the second character, **史** (shǐ), means "history" or "record." When joined, they create a precise, logical concept: a **history of illness**. This formation follows a modifier-head structure, where "病" (illness) modifies and specifies the type of "史" (history) being referred to, resulting in a term essential for medical and clinical contexts.