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1. (n.) sea urchin
any echinoderm of the class Echinoidea, having a somewhat globular or discoid form and a shell composed of many calcareous plates covered with projecting spines.
Etymology: (1585–95)
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| Definition of 'sea urchin' |
Princeton's WordNet |
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1. (noun) sea urchin
shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
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| Definition of 'sea urchin' |
Webster Dictionary |
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1. sea urchin
any one of numerous species of echinoderms of the order Echinoidea
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Definitions of sea urchin 
