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zo·an·thar·i·an | \ ˌzō-ən-ˈther-ē-ən 
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\Definition of zoantharian
: any of a subclass (Hexacorallia synonym Zoantharia) of anthozoans having tentacles or septa or both that are typically six or a multiple of six in number and including most of the recent corals and sea anemones
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