Webster's English Dictionary

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hydrozoan

hy.dro.zo.an \.hi--dr*-'zo--*n\ n [deriv. of Gk hydr- + zo-ion animal - 
   more at ZO-] : any of a class (Hydrozoa) of coelenterates that includes 
   simple and comp ound polyps and jellyfishes having no stomodaeum or gastric 
   tentacles - hydrozoan aj