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plural cnidarians
(zoology) Any of various invertebrate animals, such as jellyfish, hydras, sea anemones, corals and formerly sponges and ctenophores that belong to the phylum Cnidaria. quotations
A general feature of cnidarians, as I noted above, is their stinging cells.
2016, Peter Godfrey-Smith, Other Minds, William Collins, published 2018, page 35