Webster's English Dictionary

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porpoise

porpoise \'po.r-p*s\ n [ME porpoys, fr. MF porpois, fr. ML porcopiscis, fr. 
   L por]cus pig + piscis fish - more at FARROW, FISH 1: any of several small 
   gregarious toothed whales (genus Phocaena); (Xesp : a blunt-snouted usu. 
   largely black whale (P. phocaena) of the north Atlantic and Pacific 5 to 8 
   feet long 2: any of several dolphins