noun
shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
• Hypernyms: ↑echinoderm
• Hyponyms: ↑edible sea urchin, ↑Echinus esculentus, ↑sand dollar, ↑heart urchin
• Member Holonyms: ↑Echinoidea, ↑class Echinoidea
Useful english dictionary. 2012.