单词：arachnida 

名词

• 
  [1.n.arachnida] (同义词:[Arachnida]  [class_Arachnida]  )
• 
  注释列句：a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings
• 上位词 -> [class( n. 班级, 阶级, 社会等级, 种类, (一节)课 vt. 把...分类(或分等级) )]  [taxonomic_group]  [biological_group]  [group( n. 团体, 组, 团, 群, 批, [地]界, [化]基 v. 聚合, 成群 )]  [abstraction( n. 提取 )]  [entity( n. 实体 )] 
• 相关单词 -> [arachnid( n. 属于蜘蛛类的节肢动物 )]  [Phalangida]  [Scorpionida]  [Chelonethida]  [Pedipalpi]  [Araneae]  [Acarina] 
  所有相关单词 -> [arachnid( n. 属于蜘蛛类的节肢动物 )]  [Phalangida]  [Scorpionida]  [Chelonethida]  [Pedipalpi]  [Araneae]  [Acarina] 
  成员总称 -> [Chelicerata] 
  所有总称 -> [Chelicerata] 
  派生词 -> [arachnidian]