por·cu·pine (pôr'kyə-pīn') n. Any of various rodents of the Old World family Hystricidae or the New World family Erethizontidae, having long, sharp, erectile quills interspersed with coarse hair.
[Middle English porke despine, from Old French porc espin : Latin porcus, pig; see porko- in Indo-European roots + Latin spīna, thorn, spine.]