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  1. Oxford American Dictionary

    sea urchin

    • IPA[ˈsē ˌərCHən]

    美式

    • n.
      a marine echinoderm that has a spherical or flattened shell covered in mobile spines, with a mouth on the underside and calcareous jaws. Many species are harvested for food.

    • noun: sea urchin, plural noun: sea urchins