Webster's English Dictionary

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sunfish

sun.fish \-.fish\ n 1: a large marine plectognath fish (Mola mola) having 
   high dorsal and  anal fins and a body nearly oval in outline due to a 
   sharply truncated posterior extremity and attaining length of 10 feet and a 
   weight in excess of 2 tons 2: any of numerous American percoid freshwater 
   fishes (family Centrarchidae ) usu. with a deep compressed body and 
   metallic luster