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  2  definitions  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Arachnida  \A*rach"ni*da\,  n.  pl  [NL.,  fr  Gr  ?  spider.] 
  One  of  the  classes  of  Arthropoda.  See  Illustration  in 
  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  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Araneina  \A*ra`ne*i"na\,  n.  pl  [NL.,  fr  L.  aranea  spider.] 
  The  order  of  Arachnida  that  includes  the  spiders. 
  Note:  They  have  mandibles,  modified  a  poison  fa?gs,  leglike 
  palpi,  simple  eyes,  abdomen  without  segments,  and 
  spinnerets  for  spinning  a  web.  They  breathe  by 
  pulmonary  sacs  and  trache[ae]  in  the  abdomen.  See 
  Illustration  in  Appendix.