| sea urchin n. Any of various echinoderms of the class Echinoidea, having a soft body enclosed in a round, symmetrical, calcareous shell covered with long spines. |
sea urchin
n
(Life Sciences & Allied Applications / Animals) any echinoderm of the class Echinoidea, such as Echinus esculentus (edible sea urchin), typically having a globular body enclosed in a rigid spiny test and occurring in shallow marine waters
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  sea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shellsechinoderm - marine invertebrates with tube feet and five-part radially symmetrical bodies class Echinoidea, Echinoidea - sea urchins and sand dollars 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 |
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