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.

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