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Definition of cetacean noun from the Oxford Advanced Learner's Dictionary

cetacean

noun
 
/sɪˈteɪʃn/
 
/sɪˈteɪʃn/
(biology)
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  1. a whale, dolphin, or other sea creature that belongs to the same group
    Word Originmodern Latin (plural), from Latin cetus, from Greek kētos ‘whale’.
See cetacean in the Oxford Advanced American Dictionary
Check pronunciation: cetacean

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