Horripilate \haw-RIP-uh-leyt\ , verb;
1. To produce a bristling of the hair on the skin from cold, fear, etc.; goose flesh
According to the Oxford English Dictionary, horripilation comes from Late Latin horripilātio, which is a noun of action deriving from horripilāre. The Latin words are compounds from horrēre ("to bristle") + pilus ("hair"). Horripilate is a derivation of horripilation, as is horripilant ("causing horripilation").
*Today's word and the first definition were both taken from Dictionary.com's 'Word of the Day' for Friday, December 17