Definition of Cnidaria in English:


plural noun

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

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


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