cetacean
adjective/sɪˈteɪʃn/
/sɪˈteɪʃn/
(biology) (also cetaceous
/sɪˈteɪʃəs/
/sɪˈteɪʃəs/
)- connected with the group of creatures that includes whales and dolphinsWord Originmodern Latin (plural), from Latin cetus, from Greek kētos ‘whale’.
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cetacean