2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Crustacea  \Crus*ta"ce*a\  (kr?s-t?"sh?-?),  n.  pl  [Neut.  pl  of 
  NL  crustaceus  pert.  to  the  crust  or  shell,  from  L.  crusta 
  the  hard  surfsce  of  a  body,  rind,  shell.]  (Zo["o]l.) 
  One  of  the  classes  of  the  arthropods,  including  lobsters  and 
  crabs;  --  so  called  from  the  crustlike  shell  with  which  they 
  are  covered. 
 
  Note:  The  body  usually  consists  of  an  anterior  part  made  up 
  of  the  head  and  thorax  combined,  called  the 
  cephalothorax,  and  of  a  posterior  jointed  part  called 
  the  abdomen,  postabdomen,  and  (improperly)  tail.  They 
  breathe  by  means  of  gills  variously  attached  to  some  of 
  the  limbs  or  to  the  sides  the  body,  according  to  the 
  group  They  are  divisible  into  two  subclasses, 
  Entomostraca  and  Malacostraca,  each  of  which  includes 
  several  orders 
 
  From  WordNet  r  1.6  [wn]: 
 
  Crustacea 
  n  :  class  of  mandibulate  arthropods  including:  lobsters;  crabs; 
  shrimps;  woodlice;  barnacles;  decapods;  water  fleas  [syn: 
  {Crustacea},  {class  Crustacea}] 

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