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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hydrophyllium  \Hy`dro*phyl"li*um\,  n.;  pl  L.  {Hydrophyllia},  E. 
  {Hydrophylliums}.  [NL.,  fr  Gr  "y`dwr  water  +  ?  a  leaf.] 
  One  of  the  flat,  leaflike,  protective  zooids,  covering  other 
  zooids  of  certain  Siphonophora.