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cetacean (n.)

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

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Definitions of cetacean from WordNet
1
cetacean (n.)
large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales; dolphins; porpoises; narwhals;
Synonyms: cetacean mammal / blower
2
cetacean (adj.)
of or relating to whales and dolphins etc;
Synonyms: cetaceous
From wordnet.princeton.edu