Radiata

Ra·di·a·ta

[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).

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

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Radiata is always a great word to know.
So is doohickey. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
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