sea urchin

/ˌsi ˈʌrtʃən/
/si ˈʌtʃɪn/
IPA guide

Other forms: sea urchins

Definitions of sea urchin
  1. noun
    an echinoderm with a soft body in a thin, round, spiny, shell; usually found in shallow waters
    see moresee less
    types:
    Echinus esculentus, edible sea urchin
    a sea urchin that can be eaten
    sand dollar
    flattened disklike sea urchins that live on sandy bottoms
    heart urchin
    sea urchin having a heart-shaped body in a rigid spiny shell
    type of:
    echinoderm
    marine invertebrates with tube feet and five-part radially symmetrical bodies
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