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Thesaurus: sea urchin

Any one of numerous species of echinoderms of the order Echinoidea.

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Definitions

  1. Any one of numerous species of echinoderms of the order Echinoidea.
  2. n. shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
  3. Any one of numerous species of echinoderms of the order Echinoidea. Note: When living they are covered with movable spines which are often long and sharp.
  4. Any one of numerous species of echinoderms of the orderEchinoidea.