Etymology
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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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Definitions of horripilation

horripilation (n.)
reflex erection of hairs of the skin in response to cold or emotional stress or skin irritation;
Synonyms: pilomotor reflex / gooseflesh / goose bump / goosebump / goose pimple / goose skin
From wordnet.princeton.edu