Wiktionary
pilomotor reflex
n. Raised skin, usually caused by the involuntary erection of hairs on the neck or arms caused by cold, excitement, or fear.
WordNet
pilomotor reflex
n. reflex erection of hairs of the skin in response to cold or emotional stress or skin irritation [syn: gooseflesh, goose bump, goose pimple, goose skin, horripilation]