| NOUN | animal | heart urchin | sea urchin having a heart-shaped body in a rigid spiny shell |
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| Meaning | sea urchin having a heart-shaped body in a rigid spiny shell. | |
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| Member of | Spatangoida, order Spatangoida | heart-shaped sea urchins |
| Broader | sea urchin | shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells |
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