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]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "horripilation":
   ache, aching, agitation, broken ground, broken water, chilblains,
   chill, chilliness, chilling, chills of fear, chop, cold creeps,
   cold shivers, cold sweat, corduroy, corduroy road, corrugation,
   creeps, cryopathy, disquiet, disquietude, dithers, duck bumps,
   fear and trembling, frostbite, goose bumps, goose pimples,
   gooseflesh, heartquake, inquietude, jimjams, kibe, lop,
   nervousness, palpitation, perturbation, quaking, quiver of terror,
   ripple, rough, sandpaper, shivering, shivers, sweat,
   thrill of fear, trepidation, trepidity, uneasiness, washboard