Webster's English Dictionary

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tuna

1. tu.na \'tu:-n*\ n [Sp, fr. Taino] 1: any of various flat-jointed prickly 
   pears (genus Opuntia); esp)X : one (O. tuna) common in tropical America 2: 
   the edible fruit of a tuna 
2. tu.na \'t(y)u:-n*\ n or tuna or tunas [Amer Sp, alter. of Sp atu`n, 
   modif. of Ar tu-n, fr. L thunn] pl us, fr. Gk thynnos 1a: any of numerous 
   large vigorous scombroid fishes including forms highly  esteemed for sport 
   and food; esp : ALBACORE 1b: any of various related but usu. smaller 
   fishes; esp : BONITO  2: the flesh of a tuna esp. when canned for use as 
   food