/ sɪˈteɪʃn; NAmE / adjective , noun
( biology )
■ adjective
(also cet·aceous /sɪˈteɪʃəs/) connected with the group of creatures that includes whales and dolphins
■ noun
a whale , dolphin , or other sea creature that belongs to the same group
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WORD ORIGIN
modern Latin (plural), from Latin cetus , from Greek kētos whale.