This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any of various invertebrate animals of the phylum Cnidaria, characterized by a radially symmetrical body with a saclike internal cavity, and including the jellyfishes, hydras, sea anemones, and corals. Also called coelenterate.

adj. Of, relating to, or belonging to the phylum Cnidaria.

n. any of various invertebrate animals, such as jellyfish, hydras, sea anemones, corals and formerly sponges and ctenophores that belong to the phylum Cnidaria.

n. radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms

"A first striking finding was the high number of SOX gene sequences recovered from both the cnidarian and the ctenophore representatives (10 and 13 from C. hemisphaerica and P. pileus, respectively)."

invertebrate   

scyphozoan    hydrozoan    polyp    actinozoan    medusoid    medusan    Medusa    anthozoan    jellyfish    hydroid