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metazoamore about metazoa

metazoa


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Metazoa  \Met`a*zo"a\,  n.  pl  [NL.,  fr  Gr  ?  after  +  ?  an 
  animal.]  (Zo["o]l.) 
  Those  animals  in  which  the  protoplasmic  mass,  constituting 
  the  egg,  is  converted  into  a  multitude  of  cells,  which  are 
  metamorphosed  into  the  tissues  of  the  body.  A  central  cavity 
  is  commonly  developed,  and  the  cells  around  it  are  at  first 
  arranged  in  two  layers,  --  the  ectoderm  and  endoderm.  The 
  group  comprises  nearly  all  animals  except  the  Protozoa. 
 
  From  WordNet  r  1.6  [wn]: 
 
  Metazoa 
  n  :  multicellular  animals  having  cells  differentiated  into 
  tissues  and  organs  and  usually  a  digestive  cavity  and 
  nervous  system  [syn:  {Metazoa},  {subkingdom  Metazoa}] 




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