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

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n. See cnidarian.

n. Any simple aquatic animal bearing tentacles with nematocysts. Examples include jellyfish, coral, and anemones.

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

"Cnidaria and Ctenophora are now classified as separate phyla, and the term "coelenterate" sent off to the rubbish heap of obsolete biological terms."

invertebrate   

scyphozoan    hydrozoan    polyp    actinozoan    medusoid    medusan    Medusa    anthozoan    jellyfish    hydroid   

cnidarian