What does the word urchin mean?

Usage examples for urchin

  1. His fingers moved restlessly, like a street- urchin surveying an automobile and longing to blow its horn. – Dave Dashaway and his Hydroplane by Roy Rockwood
  2. It looks as if covered all over with great thorns, and a baby sea- urchin looks as if it was all ready to burst, it is so thick and round. – Lord Dolphin by Harriet A. Cheever