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New American Oxford Dictionary

Holothuroidea

Hol o thu roi de a |ˌhälōTHo͝orˈoidēə, ˌhōlō -ˌhɑloʊθʊˈrɔɪdiə |Zoology a class of echinoderms that comprises the sea cucumbers. DERIVATIVES hol o thu roid |-ˈTHo͝orˌoid |noun & adjective ORIGIN modern Latin (plural ), based on Greek holothourion (see holothurian ).

Oxford Dictionary

Holothuroidea

Holothuroidea |ˌhɒlə (ʊ )θjʊəˈrɔɪdɪə | ▶plural noun Zoology a class of echinoderms that comprises the sea cucumbers. DERIVATIVES holothuroid |ˈhɒlə (ʊ )θjʊərɔɪd |noun & adjective ORIGIN modern Latin (plural ), based on Greek holothourion (see holothurian ).