单词：zenithal 

形容词

• 
  [1.a.zenithal] (同义词:[zenithal( adj. 天顶的, 绝顶的 )]  )
• 
  注释列句：relating to or located at or near the zenith
• 派生词 -> [zenith( n. 顶点, 顶峰, 天顶, 最高点 )] 
  属于名词 -> [zenith( n. 顶点, 顶峰, 天顶, 最高点 )]