cetaceous

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ce·ta·cean

 (sĭ-tā′shən)
n.
Any of various marine mammals of the order Cetacea, including the whales, dolphins, and porpoises, having the general shape of a fish with forelimbs modified to form flippers, a tail with horizontal flukes, and one or two blowholes for breathing.

[From New Latin Cētācea, order name, from Latin cētus, whale; see Cetus.]

ce·ta′cean, ce·ta′ceous (-shəs) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.cetaceous - of or relating to whales and dolphins etc