[rey-dee-ey-tuh, -ah-tuh]
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).

1820–30; < Neo-Latin, noun use of neuter plural of Latin radiātus radiate (adj.)

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