Echinoidea definition

  • proper-noun:
    • A taxonomic class inside the superclass Cryptosyringida — the ocean urchins.
  • noun-plural:
    • The course Echinodermata which include the ocean urchins. Obtained a calcareous layer, frequently almost spheroidal or disk-shaped, composed of numerous united plates, and covered with movable spines. See spatangoid, clypeastroid.
  • others:
    • A class of phylum or subkingdom Echinodermata; the sea-urchins or sea-eggs.
  • noun:
    • water urchins and sand dollars

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