Shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells.
 
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"Sea urchin" Quotes from Famous Books — The Depot Master • Joseph C. Lincoln  | 
Words linked to "Sea urchin" :   Echinus esculentus, sand dollar, class Echinoidea, heart urchin, Echinoidea, echinoderm, edible sea urchin  | 
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