Definition that contains urchin
- test a hard outer covering as of some amoebas and sea urchins
- ragamuffin a dirty shabbily clothed urchin
- class echinoidea sea urchins and sand dollars
- heart urchin sea urchin having a heart-shaped body in a rigid spiny shell
- echinus esculentus a sea urchin that can be eaten
- order exocycloida flat sea urchins
- sand dollar flattened disklike sea urchins that live on sandy bottoms
- tatterdemalion a dirty shabbily clothed urchin
- edible sea urchin a sea urchin that can be eaten
- echinodermata radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers