<p><strong>Noun:</strong></p><ul><li>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.</li><li>Compare cnidarian.</li></ul><p><strong>Adjective:</strong></p><ul><li>Belonging or pertaining to the Coelenterata.</li></ul>