Cnidaria

noun

1. hydras; polyps; jellyfishes; sea anemones; corals

   noun.animal

   Synonyms coelenterata phylum cnidaria phylum coelenterata

   Source: WordNet 3.0

2. A comprehensive group equivalent to the true C&oelig;lenterata, <i>i. e.</i>, exclusive of the sponges. They are so named from presence of stinging cells (<i>cnidae</i>) in the tissues. See <u>Coelenterata</u>.

   noun

   Source: webster1913