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Horripilate is a technical term meaning to make the hair stand up—to trigger goose bumps. It can also mean to experience this—to get goose bumps.

This can happen due to cold, fear, or excitement. The process or an instance of this is called horripilation (or piloerection).

Horripilation doesn’t only happen in humans. When some animals get startled or threatened, their fur raises in response. (When the fur becomes raised in this way on the neck, such as on a dog or cat, we say they’ve raised their hackles.)

The same thing happens in humans, and is usually most noticeable in places where we don’t have much hair or the hair is very fine, such as the arms and neck.

Example: Horror movies have the power to horripilate the viewer.

The first records of the word horripilate come from the 1600s. It comes from the Latin verb ��ǰ������辱�������, “to become bristly.” The first part comes from the Latin verb ��ǰ���ŧ����, “to stand on end,” “to tremble,” or “to bristle with fear.” The second part comes from the Latin pilus, meaning “hair” (the pilo- part of piloerection can be traced back to the same root). The word horror (and related words like horrify and horrific) also derives from ��ǰ���ŧ���� and is based on hair standing on end due to fear.

Horripilation in response to being scared has led to the term hair-raising to describe a frightening experience. Biologically speaking, things that horripilate cause an involuntary reaction called the pilomotor reflex. It involves the contraction of tiny muscles at the base of each hair follicle called arrector��pili (a name that’s based on the same roots as piloerection). This contraction results in the hairs standing up. When there’s no hair there or the hairs are very small, this reaction appears as bumps on the skin. These bumps are said to resemble those on the skin of a goose that has had its feathers plucked, hence the name goose bumps.

What are some other forms related to horripilate?

• horripilation (noun)

What are some words that share a root or word element with horripilate?��

• horror
• pilomotor reflex
• pilose
• piloid

What are some words that often get used in discussing horripilate?

• piloerection
• goose bumps
• goose pimples
• gooseflesh
• goose skin
• hair
• skin
• raised
• stand
• hair-raising
• fear
• cold
• reflex

Horripilate is a technical term. In everyday conversation, people usually just say that something gave them goose bumps.

Kelley Armstrong’s guide to novels guaranteed to horripilate for Halloween http://tgam.ca/BDvb

— Globe Books (@globebooks)

I just saw a photograph of locusts all over trees in MP & it made me horripilate. Imagine the poor farmers coping with this kind of havoc, trying to save their crops – for them, and us. And what is the government of doing? Jailing students and dissenters. Sick!

— g.arunima (@anuarunima1)

Every word spoken horrifyingly; a library of words to horripilate; each horripilation.

— Library of Every (@libraryofevery)

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Which of the following things can horripilate?

A. fear
B. cold
C. excitement
D. all of the above