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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Alcyonium  \Al`cy*o"ni*um\,  n.  [Gr.  ?  a  zo["o]phyte,  so  called 
  from  being  like  the  halcyon's  nest.]  (Zo["o]l.) 
  A  genus  of  fleshy  Alcyonaria,  its  polyps  somewhat  resembling 
  flowers  with  eight  fringed  rays.  The  term  was  also  formerly 
  used  for  certain  species  of  sponges.