Cnidaria

noun plural
Cni·​dar·​ia | \ nī-ˈdar-ē-ə How to pronounce Cnidaria (audio) \

Medical Definition of Cnidaria

: a phylum of more or less radially symmetrical invertebrate animals that lack a true body cavity, possess tentacles studded with nematocysts, and include the hydroids, jellyfishes, sea anemones, and corals

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