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Definitions of urchin
  1. noun
    poor and often mischievous city child
Definition that contains urchin
  • test a hard outer covering as of some amoebas and sea urchins
  • ragamuffin 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
  • spatangoida heart-shaped sea urchins
  • order spatangoida heart-shaped sea urchins
  • exocycloida flat sea urchins
  • echinoidea sea urchins and sand dollars
  • phylum echinodermata radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers
  • tube foot tentacular tubular process of most echinoderms (starfish and sea urchins and holothurians) having a sucker at the end and used for e.g. locomotion and respiration
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