nandrolone
noun [ U ] uk/ˈnæn.drə.ləʊn/ us/ˈnæn.drə.loʊn/
诺龙（一种能提高体能和耐力的物质，在体育比赛中多被禁用）
a substance that can improve someone's physical strength and stamina (= the ability to do something for a long period). It is not allowed in most sports competitions.