urchin: [13] Urchin originally meant ‘hedgehog’. It was borrowed from Old Northern French herichon, which came via Vulgar Latin *hēriciō from Latin hērīcius or ērīcius ‘hedgehog’, a derivative of ēr ‘hedgehog’. This ancestral sense now survives only dialectally, but its spiny connotations are preserved in sea urchin, which dates from the late 16th century. The metaphorical ‘dirty scruffy child, brat’ emerged in the 16th century too. The second syllable of caprice goes back to Latin ērīcius. => caprice[urchin etymology, urchin origin, 英语词源]