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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Arthrostraca  \Ar*thros"tra*ca\,  n.  pl  [NL.,  fr  Gr  'a`rqron 
  joint  +  ?  a  shell.]  (Zo["o]l.) 
  One  of  the  larger  divisions  of  Crustacea,  so  called  because 
  the  thorax  and  abdomen  are  both  segmented;  Tetradecapoda.  It 
  includes  the  Amphipoda  and  Isopoda.