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Noun sea urchin has 1 sense
  1. sea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
    --1 is a kind of     echinoderm
    --1 is a member of Echinoidea, class Echinoidea
    --1 has particulars:
     edible sea urchin, Echinus esculentus; sand dollar; heart urchin
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