1. cnidarian

noun. Radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms.
Synonyms
medusa actinozoan jellyfish Coelenterata invertebrate Cnidaria hydrozoan coelenterate medusoid phylum Coelenterata anthozoan hydroid scyphozoan coelenteron phylum Cnidaria polyp medusan
Antonyms
vertebrate
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