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noun
Shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells.
is a specific kind of: echinoderm.
is a broader term that covers: Echinus esculentus, edible sea urchin | sand dollar | heart urchin.
is a member of: class Echinoidea, Echinoidea.
Dutch: zee-egel, zeeëgelPolish: jeżowce
Find more on sea urchin elsewhere: etymology - rhymes - Wikipedia.
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