echinoderm definition, echinoderm meaning | English dictionary

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echinoderm

  

      n   any of the marine invertebrate animals constituting the phylum Echinodermata, characterized by tube feet, a calcite body-covering (test), and a five-part symmetrical body. The group includes the starfish, sea urchins, and sea cucumbers  
  echinodermal, echinodermatous      adj  
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