- horripilation (n.)
- 1650s, from Late Latin horripilationem (nominative horripilatio), noun of action from past participle stem of horripilare "bristle with hairs, be shaggy," from stem of horrere "to bristle" (see horror) + pilus "hair" (see pile (n.3)). The verb horripilate is attested from 1620s.
