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Noun echinoidea has 1 sense
  1. Echinoidea, class Echinoidea - sea urchins and sand dollars
    --1 is a kind of class
    --1 is a member of Echinodermata, phylum Echinodermata
    --1 has members:
     sea urchin; Exocycloida, order Exocycloida; Spatangoida, order Spatangoida
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