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echinoderm any of various marine animals that have parts radiating symmetrically from the center and hard, often spiny outer body walls, such as the starfishes and sea urchins.
sand dollar any of various flat, circular sea urchins that live on sandy ocean beds near the shore.
urchin a marine invertebrate having movable projecting spines on a roundish body; sea urchin. [1/2 definitions]