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Definitions for echinoidea

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Princeton's WordNet

  1. Echinoidea, class Echinoidea(noun)

    sea urchins and sand dollars

Webster Dictionary

  1. Echinoidea

    the class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid

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