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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hydromedusa  \Hy`dro*me*du"sa\,  n.;  pl  {Hydromedus[ae]}.  [NL. 
  See  {Hydra},  and  {Medusa}.]  (Zo["o]l.) 
  Any  medusa  or  jellyfish  which  is  produced  by  budding  from  a 
  hydroid.  They  are  called  also  {Craspedota},  and  {naked-eyed 
  Note:  Such  medus[ae]  are  the  reproductive  zooids  or 
  gonophores,  either  male  or  female,  of  the  hydroid  from 
  which  they  arise,  whether  they  become  free  or  remain 
  attached  to  the  hydroid  colony.  They  in  turn  produce 
  the  eggs  from  which  the  hydroids  are  developed.  The 
  name  is  also  applied  to  other  similar  medus[ae]  which 
  are  not  known  to  bud  from  a  hydroid  colony,  and  even  to 
  some  which  are  known  to  develop  directly  from  the  eggs, 
  but  which  in  structure  agree  essentially  with  those 
  produced  from  hydroids.  See  {Hydroidea},  and