The Collaborative International Dictionary of English v.0.48:

Horripilation \Hor*rip`i*la"tion\, n. [L. horripilatio, fr.
   horripilare to bristle; horrere to bristle + pilus the hair:
   cf. F. horripilation.] (Med.)
   A real or fancied bristling of the hair of the head or body,
   resulting from disease, terror, chilliness, etc.
   [1913 Webster]

WordNet (r) 3.0 (2006):

horripilation
    n 1: reflex erection of hairs of the skin in response to cold or
         emotional stress or skin irritation [syn: pilomotor
         reflex, gooseflesh, goose bump, goosebump, goose
         pimple, goose skin, horripilation]