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Echinoidea   Listen
noun
Echinoidea  n. pl.  (Written also Echinidea, and Echinoida)  (Zoöl.) The class Echinodermata which includes the sea urchins. They have a calcareous shell, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid.






Collaborative International Dictionary of English 0.48








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Words linked to "Echinoidea" :   Exocycloida, class, Echinodermata, Spatangoida



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