- Any of many marine echinoderms, of the class Echinoidea, commonly found in shallow water, having a complex chewing structure named Aristotle's lantern
Etymology: sea + urchin (meaning hedgehog), due to the similarity in appearance to the hedgehog.
- Dutch: zeeí«gel
- French: hérisson de mer
- German: Seeigel
- Spanish: erizo de mar
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