The Chinese term for depression, 抑郁症 (yì yù zhèng), is a medically constructed compound word formed through logical semantic combination: the first character 抑 (yì) means "to suppress" or "restrain," the second 郁 (yù) conveys "gloomy," "melancholy," or "pent-up," and the final character 症 (zhèng) means "disorder" or "disease." Thus, the term literally and conceptually describes a disorder characterized by suppressed, pent-up melancholy, effectively capturing the core symptom of constricted mood and emotional stagnation that defines the clinical condition.