adj rough; pricking; piercing.
2. urchin ·noun a sea urchin. ·see sea urchin.
3. urchin ·noun a hedgehog.
4. urchin ·noun a pert or roguish child;
now commonly used only of a boy.
5. urchin ·noun a mischievous elf supposed sometimes to take the form a hedgehog.
6. urchin ·noun 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.