cetologist

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ce·tol·o·gy

C0219100 (sĭ-tŏl′ə-jē)n. The zoology of whales and related aquatic mammals.
[Latin cētus, whale; see Cetus + -logy.]
ce′to·log′i·cal (sēt′l-ŏj′ĭ-kəl) adj.ce·tol′o·gist n.