cetology Syllabification: (ce·tol·o·gy)Pronunciation: /sēˈtäləjē/Definition of cetology noun the branch of zoology that deals with whales, dolphins, and porpoises. Derivatives cetologist noun Origin: mid 19th century: from Latin cetus 'whale' (see Cetacea) + -logycetology in other Oxford dictionaries Definition of cetology in the British & World English dictionary