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cetacean

[si-tey-shuh n] /sɪˈteɪ ʃən/
adjective
1.
belonging to the Cetacea, an order of aquatic, chiefly marine mammals, including the whales and dolphins.
noun
2.
a cetacean mammal.
Origin
1830-1840
1830-40; < Neo-Latin Cetace(a) name of the order (see cet-, -acea) + -an
Related forms
cetaceous, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cetaceous

cetacean

/sɪˈteɪʃən/
adjective
1.
of, relating to, or belonging to the Cetacea, an order of aquatic placental mammals having no hind limbs and a blowhole for breathing: includes toothed whales (dolphins, porpoises, etc) and whalebone whales (rorquals, right whales, etc)
noun
2.
a whale
Word Origin
C19: from New Latin Cētācea, ultimately from Latin cētus whale, from Greek kētos
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for cetaceous
cetacean
1836, from cetacea (1830), order of marine mammals, Mod.L., from L. cetus, from Gk. ketos "whale."
Online Etymology Dictionary, © 2010 Douglas Harper
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cetaceous in Science
cetacean
  (sĭ-tā'shən)   
Any of various, often very large aquatic mammals of the order Cetacea, having a hairless body that resembles that of a fish. Cetaceans have an elongated skull, a flat, horizontal tail, forelimbs modified into broad flippers, and no hind limbs. They breathe through blowholes located usually at the top of the skull. Whales, dolphins, and porpoises are cetaceans. See more at baleen whale, toothed whale.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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