xiphosuran /ˌzɪfəˈsjʊərən/

• 1.  

  N（名词） any chelicerate arthropod of the subclass Xiphosura, including the horseshoe crabs and many extinct forms 剑尾目动物
• 2.  

  ADJ（形容词） of, relating to, or belonging to the subclass Xiphosura 剑尾目动物的