Noun: sea urchin 'see'ur-chin
- Shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
"Divers carefully avoided stepping on sea urchins while exploring the reef";
- urchin
Derived forms: sea urchins
Type of: echinoderm
Part of: class Echinoidea, Echinoidea
Encyclopedia: Sea urchin