The Collaborative International Dictionary of English v.0.48:
Cetacean \Ce*ta"cean\, n. (Zool.) One of the Cetacea. [1913 Webster]WordNet (r) 3.0 (2006):
cetacean adj 1: of or relating to whales and dolphins etc [syn: cetacean, cetaceous] n 1: large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales; dolphins; porpoises; narwhals [syn: cetacean, cetacean mammal, blower]