Cnidaria
noun plural
Cni·dar·ia
nī-ˈdar-ē-ə 
: 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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“Cnidaria.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Cnidaria. Accessed 13 May. 2025.
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