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 Arachnida
 蛛形綱

 Arach·ni·da /əˈræknədə/ 名詞 複數

 A·rach·ni·da n. pl.  Zool. One of the classes of Arthropoda. See Illustration in Appendix.
 Note: ☞ They have four pairs of legs, no antennæ nor wings, a pair of mandibles, and one pair of maxillæ or palpi. The head is usually consolidated with the thorax. The respiration is either by trancheæ or by pulmonary sacs, or by both. The class includes three principal orders: {Araneina}, or spiders; {Arthrogastra}, including scorpions, etc.; and {Acarina}, or mites and ticks.
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 Arachnida
      n : a large class of arthropods including spiders and ticks and
          scorpions and daddy longlegs; have four pairs of walking
          legs and no wings [syn: class Arachnida]