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cetacean (noun) – Any of various marine mammals of the order Cetacea, including the whales, dolphins, and porpoises, having the general shape of a fish with forelimbs modified to form flippers, a tail with horizontal flukes, and one or two blowholes for breathing.

Source : The Free Dictionary

Etymology : 1836, from Cetacea, name of the order of marine mammals, + -an. As an adjective, “pertaining to the whale,” from 1839.