(pilo- + erection) erection of the hair.
<dermatology> Erection of the hair. ... (18 Nov 1997) ... 
(pi″lo-e-rek´shәn) horripilation.
Type: Term Pronunciation: pī′lō-ē-rek′shŭn Definitions: 1. Erection of hair due to action of arrectores pilorum muscles.
Piloerection: Erection of the hair of the skin. Piloerection of the hair, for example, on the arm makes it 'stand on end.' Piloerection starts when a stimulus such as cold or fright causes a discharge from the (involuntary) nervous system that triggers contraction of the little arrectores pilorum muscles. Contraction of these muscles elevates the h...
piloerection 1. A skin reaction caused by erection of the hair follicles, as from cold or shock due to contraction of the arrector pili muscles. This causes transient roughness of the skin. 2. An involuntary erection or bristling of hairs due to a sympathetic reflex usually triggered by cold, shock, or fright, or due to a sympathomimetic agent. '...