sea urchin

English Thesaurus

1. shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells (noun.animal)

hypernym	:	echinoderm,
definition	:	marine invertebrates with tube feet and five-part radially symmetrical bodies (noun.animal)

hyponym	:	echinus esculentus, edible sea urchin,
definition	:	a sea urchin that can be eaten (noun.animal)

hyponym	:	sand dollar,
definition	:	flattened disklike sea urchins that live on sandy bottoms (noun.animal)

hyponym	:	heart urchin,
definition	:	sea urchin having a heart-shaped body in a rigid spiny shell (noun.animal)

member meronym	:	class echinoidea, echinoidea,
definition	:	sea urchins and sand dollars (noun.animal)