bn:00070003n
Noun Concept
Categories: Developmental biology, Late Ordovician first appearances, Articles with short description, Negligibly senescent organisms, Commercial echinoderms
EN
sea urchin  hurcheon  sea-urchin  urchin  Apical disc
EN
Shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells WordNet 3.0
Definitions
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EN
Shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells WordNet 3.0 & Open English WordNet
Sea urchins are spiny, globular echinoderms in the class Echinoidea. Wikipedia
Spiny marine echinoderm. Wikipedia Disambiguation
Class of marine invertebrates Wikidata
Zoophyte with a calcareous shell ornated with mobile spines. OmegaWiki
Any of many marine echinoderms, of the class Echinoidea, commonly found in shallow water, having a complex chewing structure named Aristotle's lantern. Wiktionary
Any of many marine echinoderms of the class Echinoidea. Wiktionary (translation)