Etymology
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Cnidaria (n.)

phylum of stinging invertebrates, 1860, with abstract noun ending -ia + Latinized form of Greek knidē "nettle," from stem of knizein "to scratch scrape," which is of uncertain origin. Beekes compares Lithuanian knìsti "to scratch, itch, tickle," knisù "to grub up;" Latvian knidet "to itch, geminate, creep;" Old Norse hnita "to push against;" Middle Irish cned "wound." Related: Cnidarian.

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Definitions of Cnidaria

Cnidaria (n.)
hydras; polyps; jellyfishes; sea anemones; corals;
Synonyms: phylum Cnidaria / Coelenterata / phylum Coelenterata
From wordnet.princeton.edu