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From Longman Dictionary of Contemporary English
Related topics: Animals
cetaceance‧tac‧ean /sɪˈteɪʃən/ noun [countable]  HBA technical a mammal that lives in the sea, such as a whalecetacean adjective
Examples from the Corpus
cetaceanSound production and hearing in the Bottle-nosed dolphin had been studied more than those of any other cetacean.Public concern over the popular cetacean has mounted as numbers have rapidly declined.The biggest danger for any stranded cetacean is overheating.
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