1. Poor and often mischievous city child
   "The street urchin picked pockets to survive in the harsh urban environment"
    
2. Shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
   "Divers carefully avoided stepping on sea urchins while exploring the reef";
   - sea urchin

Derived forms: urchins

Type of: child, echinoderm, kid [informal], kiddie [informal], kiddy [informal], minor, nestling [informal], nipper [informal], shaver [informal], small fry [informal], tiddler [Brit, informal], tike [informal], tyke [informal], wean [UK, Ireland, dialect], youngster

Part of: class Echinoidea, Echinoidea

Encyclopedia: Urchin