cetacea

Word Origin & History

Cetacea
"order of marine mammals containing whales," 1830, Mod.L., from L. cetus, from Gk. ketos "a whale." Hence cetology "the study of whales," first attested 1851 in "Moby Dick."
Online Etymology Dictionary, © 2010 Douglas Harper
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WordNet
cetacea

noun
an order of Eutheria 
WordNet® 3.0, © 2006 by Princeton University.
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