伤员 (shāng yuán) is a noun meaning 'wounded person' or 'casualty' — it refers specifically to a person who has been injured, especially in a disaster, accident, or war. Unlike 伤 (shāng, 'injury/wound') or 伤口 (shāng kǒu, 'wound/cut'), which describe the injury itself, 伤员 focuses on the injured individual. It is more specific than 伤亡 (shāng wáng, 'casualties'), which includes both injuries and deaths.