The Chinese word **避孕药** (bìyùn yào) is a compound noun formed through semantic combination, where **避** (bì) means "to avoid," **孕** (yùn) means "pregnancy," and **药** (yào) means "medicine" or "drug." The first two characters, **避孕**, form a verb-object phrase meaning "to avoid pregnancy," which then acts as a modifier for the head noun **药**, creating the meaning "medicine for avoiding pregnancy," or simply "contraceptive pill." This structure follows the common Chinese word-formation pattern of a descriptive modifier (stating the function or purpose) placed before a core noun.