ce ‧ tac ‧ ean /sɪˈteɪʃ ə n/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: Latin ; Origin: cetus 'whale' , from Greek ketos ]
technical a ↑ mammal that lives in the sea, such as a ↑ whale
—cetacean adjective
ce ‧ tac ‧ ean /sɪˈteɪʃ ə n/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: Latin ; Origin: cetus 'whale' , from Greek ketos ]
technical a ↑ mammal that lives in the sea, such as a ↑ whale
—cetacean adjective
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012