Medical Dictionary

Cnidaria

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noun plural Cni·dar·ia \nī-ˈdar-ē-ə\

Medical Definition of Cnidaria

  1. :  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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