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From The Collaborative International Dictionary of English v.0.48:
Urchin \Ur"chin\ ([^u]"ch[i^]n), n. [OE. urchon, irchon, a hedgehog, OF. ire[,c]on, eri[,c]on, heri[,c]on, herichon, F. h['e]risson, a derivative fr. L. ericius, from er a hedgehog, for her; akin to Gr. chh`r. Cf. Herisson.] [1913 Webster] 1. (Zool.) A hedgehog. [1913 Webster] 2. (Zool.) A sea urchin. See Sea urchin. [1913 Webster] 3. A mischievous elf supposed sometimes to take the form a hedgehog. "We 'll dress [them] like urchins, ouphes, and fairies." --Shak. [1913 Webster] 4. A pert or roguish child; -- now commonly used only of a boy. [1913 Webster] And the urchins that stand with their thievish eyes Forever on watch ran off each with a prize. --W. Howitt. [1913 Webster] You did indeed dissemble, you urchin you; but where's the girl that won't dissemble for an husband? --Goldsmith. [1913 Webster] 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. --Knight. [1913 Webster] Urchin fish (Zool.), a diodon. [1913 Webster]