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  Word: Echinoidea

  ID	Word	Wordtype	Definition
  49429	Echinoidea	n. pl.	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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