Lewis Short
(verb) : horrĭpĭlo, āre, horreo-pilus
* To bristle with hairs, be shaggy (post-class.): aures immodicis horripilant auctibus,App. M. 3, p. 140: horripilo ὀρθοτριχάω, horripilatur ὀρθοτριχεῖ, Gloss. Philox.
Charlton T. Lewis, Charles Short, A Latin Dictionary