Webster's English Dictionary

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cetacean

ce.ta.cean \si-'ta--sh*n\ \-sh*s\ n [deriv. of L cetus whale, fr. Gk 
   ke-tos] : any of an order (Cetacea) of aquatic mostly marine mammals 
   including the  whales, dolphins, porpoises, and related forms with large 
   head, fishlike nearly hairless body, and paddle-shaped forelimbs - cetacean 
   aj