Webster's English Dictionary

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urchin

ur.chin \'*r-ch*n\ n [ME, fr. MF herichon, fr. L ericius, fr. er; akin to 
   Gk ch]e-r hedgehog, L horre-re to bristle, tremble 1: HEDGEHOG  2: a pert 
   or roguish youngster  3: SEA URCHIN