noun
the bristling of the body hair or feathers as a response to cold, fear, or other strong emotions
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The medical term for horripilation is piloerection, which is the involuntary contraction of small muscles at the base of hair follicles.
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I get horripilation whenever I watch a scary movie.
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That horror movie gave me the chills and full-on horripilation.
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The emotional speech by the president caused a wave of horripilation among the audience.