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[rey-dee-ey-tuh, -ah-tuh] /ˌreɪ diˈeɪ tə, -ˈɑ tə/

noun, Biology.
(in some classification systems) a major grouping that includes more or less radially symmetrical animals, as coelenterates (jellyfish, sea anemones, corals), ctenophores (comb jellies), and echinoderms (starfish, sea urchins, sea cucumbers).


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