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arachnida

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arachnida


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Arachnida  \A*rach"ni*da\,  n.  pl  [NL.,  fr  Gr  ?  spider.] 
  (Zo["o]l.) 
  One  of  the  classes  of  Arthropoda.  See  Illustration  in 
  Appendix. 
 
  Note:  They  have  four  pairs  of  legs,  no  antenn[ae]  nor  wings, 
  a  pair  of  mandibles,  and  one  pair  of  maxill[ae]  or 
  palpi.  The  head  is  usually  consolidated  with  the 
  thorax.  The  respiration  is  either  by  tranche[ae]  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. 
 
  From  WordNet  r  1.6  [wn]: 
 
  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:  {Arachnida},  {class  Arachnida}] 




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