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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Clypeastroid  \Clyp`e*as"troid\,  a.  [NL.  Clypeaster  (L.  clupeus 
  shield  +  aster  star)  +  -oid.]  (Zo["o]l.) 
  Like  or  related  to  the  genus  {Clupeaster};  --  applied  to  a 
  group  of  flattened  sea  urchins,  with  a  rosette  of  pores  on 
  the  upper  side