echinoderm definition

  • noun:
    • Any of many radially symmetrical marine invertebrates associated with phylum Echinodermata, including the starfishes, sea urchins, and sea cucumbers, having an interior calcareous skeleton and frequently covered with spines.
    • Any member of the Echinodermata, a small grouping of radially symmetric, spiny-skinned marine pets. Types of echinoderms feature seastars, sea urchins, water cucumbers, crinoids, and sand bucks.
    • among Echinodermata.
    • Any one for the Echinodermata.
    • marine invertebrates with tube foot and five-part radially shaped systems
  • others:
    • Having a prickly addressing; echinodermatous.

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