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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Helianthoidea  \He`li*an"thoi"de*a\,  n.  pl  [NL.,  fr  L. 
  helianthes  sunflower  +  -oid.]  (Zo["o]l.) 
  An  order  of  Anthozoa;  the  Actinaria.