• The class Echinodermata which includes the sea urchins. Theyhave a calcareous, usually more or less spheroidal or disk-shaped,composed of many united plates, and covered with movable spines. SeeSpatangoid, Clypeastroid. [Written also Echinidea, and Echinoida.]


    Echinoidea meaning & definition 1 of Echinoidea.

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