Definition of Cnidaria in English:


plural noun

  • A phylum of aquatic invertebrate animals that comprises the coelenterates.

    • ‘In any case, there is molecular evidence to suggest that the Anthozoa are the earliest branch of the phylum Cnidaria.’
    • ‘Jellyfish belong to one of the oldest extant animal phyla, the Cnidaria.’
    • ‘The Cnidaria and Ctenophora are grouped together by some workers as the Coelenterata.’
    • ‘Four phyla (Placozoa, Porifera, Cnidaria, and Ctenophora) are typically thought to have an ancient origin within Metazoa.’
    • ‘By this usage, the basal metazoans comprise just four phyla (Placozoa, Porifera, Cnidaria, and Ctenophora) and the large clade Bilateria.’
    • ‘Members of the phylum Cnidaria, these animals have capsule-shaped cells with a trapdoor-like lid, containing a stinging nematocyst.’
    • ‘The phylum Cnidaria comprises approximately 10,000 species of tentacle bearing aquatic animals.’
    • ‘Sea anemones (Phylum Cnidaria; Class Anthozoa, Order Actiniaria) exhibit a diversity of developmental patterns that include cloning by fission.’
    • ‘Despite these attempts, relationships among Bilateria, Cnidaria, Ctenophora, Placozoa, and Porifera remain obscure.’
    • ‘Actually, there are a number of topologically reasonable ways to create an inner compartment, and most can be found within the embryological diversity of the Cnidaria and Ctenophora.’


Modern Latin (plural), from Greek knidē ‘nettle’.