Cni·da·ri·a n. pl. Zool. A comprehensive group equivalent to the true Cœlenterata, i. e., exclusive of the sponges. They are so named from presence of stinging cells (cnidae) in the tissues. See Coelenterata.
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Cnidaria
n : hydras; polyps; jellyfishes; sea anemones; corals [syn: phylum
Cnidaria, Coelenterata, phylum Coelenterata]