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New American Oxford Dictionary

superclass

su per class |ˈso͞opərˌklas ˈsupərklæs | ▶noun Biology a taxonomic category that ranks above class and below phylum.

 

Oxford Dictionary

superclass

super |class |ˈsuːpəklɑːs, ˈsjuː -| ▶noun Biology a taxonomic category that ranks above class and below phylum.