| 释义 |
sea urchin
noun
1. : an echinoderm of the class Echinoidea; especially : one of somewhat oblate form having a thin brittle shell or test of calcareous plates covered with well-developed and often very sharp movable spines as distinguished from the disk-shaped sand dollars or cake urchins and the heart urchins which also belong to the Echinoidea
2. Australia : cushionflower |