DICT.TW Dictionary Taiwan

 Ech·i·noi·de·a n. pl.  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. [Written also Echinidea, and Echinoida.]
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