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Cetacea (n.)

order of marine mammals containing whales, 1795, Modern Latin, from Latin cetus "any large sea creature" (whales, seals, dolphins), from Greek kētos "a whale, a sea monster," which is of unknown origin, + -acea.

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Definitions of Cetacea

Cetacea (n.)
an order of Eutheria;
Synonyms: order Cetacea
From wordnet.princeton.edu