noun
a marine mammal of the order Cetacea, which includes whales, dolphins, and porpoises
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The study of cetacean behavior is a complex and fascinating field of research.
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I saw a group of cetaceans swimming in the ocean today, they were so graceful.
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Dude, did you see that huge cetacean jump out of the water? It was epic!
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Her singing voice was like the song of a majestic cetacean, powerful and beautiful.