CETACEAN
\sɛtˈe͡ɪʃən], \sɛtˈeɪʃən], \s_ɛ_t_ˈeɪ_ʃ_ə_n]\
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large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales; dolphins; porpoises; narwhals
By Princeton University