Webster's English Dictionary

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scyphozoan

scy.pho.zo.an \.si--f*-'zo--*n\ n [NL Scyphozoa, class name, fr. L scyphus 
   + NL -zoa] : any of a class (Scyphozoa) of coelenterates comprising 
   jellyfishes lacki ng a true polyp and usu. a velum - scyphozoan aj