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sea urchin

DEFINITIONS OF: sea urchin

1

n shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells

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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