echinoderma

Definitions of echinoderma
  1. noun
    marine invertebrates with tube feet and five-part radially symmetrical bodies
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    types:
    crinoide
    primitive echinoderms having five or more feathery arms radiating from a central disk
    type of:
    invertebrato
    any animal lacking a backbone or notochord; the term is not used as a scientific classification
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