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The Collaborative International Dictionary
Urchin fish

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.]

  1. (Zo["o]l.) A hedgehog.

  2. (Zo["o]l.) 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.''
    --Shak.

  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.
    --Knight.

    Urchin fish (Zo["o]l.), a diodon.

Wiktionary
urchin fish

n. A porcupine fish.