ur·chin /ˈɝʧən/
 淘氣鬼,頑童,小孩
 Ur·chin n.
 1. Zool. A hedgehog.
 2. Zool. A sea urchin. See Sea urchin.
 3. A mischievous elf supposed sometimes to take the form a hedgehog. “We 'll dress [them] like urchins, ouphes, and fairies.”
 4. A pert or roguish child; -- now commonly used only of a boy.
 And the urchins that stand with their thievish eyes
 Forever on watch ran off each with a prize.   --W. Howitt.
    You did indeed dissemble, you urchin you; but where's the girl that won't dissemble for an husband?   --Goldsmith.
 5. One of a pair in a series of small card cylinders, arranged around a carding drum; -- so called from its fancied resemblance to the hedgehog.
 Urchin fish Zool., a diodon.
 Ur·chin, a. Rough; pricking; piercing. [R.] “Helping all urchin blasts.”
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 urchin
      n : poor and often mischievous city child