sea urchin(n = noun.animal) - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells;
is a kind of echinoderm
is a member of class echinoidea, echinoidea
has particulars: echinus esculentus, edible sea urchin, sand dollar, heart urchin
Any one of numerous species of echinoderms of the order
"When living they are covered with movable spines which are often long and sharp." [1913 Webster]
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