Pronunciation: (si-len'tu-rāt", -tur-it),[key] —n. any invertebrate animal of the phylum Coelenterata, including the hydras, jellyfishes, sea anemones, and corals, characterized by a single internal cavity serving for digestion, excretion, and other functions and having tentacles on the oral end. Cf. cnidarian.
—adj. belonging or pertaining to the Coelenterata.