单词：pd 

名词

• 
  [1.n.pd] (同义词:[palladium( n. [化]钯 )]  [Pd(=per day 每日 )]  [atomic_number_46]  )
• 
  注释列句：a silver-white metallic element of the platinum group that resembles platinum; occurs in some copper and nickel ores; does not tarnish at ordinary temperatures and is used (alloyed with gold) in jewelry
• 上位词 -> [metallic_element]  [chemical_element]  [substance( n. 物质, 实质, 主旨 )]  [matter( n. 事件, 问题, 物质, 内容, 实质, 原因, (印刷或书写的)文件, (文章或讲话等的)素材 vi. 有关系, 要紧 )]  [physical_entity]  [entity( n. 实体 )]