: one of the small fan-shaped smooth muscles associated with the base of each hair that contract when the body surface is chilled and erect the hairs, compress an oil gland above each muscle, and produce the appearance of goose bumps
called also erector pili muscle, pilomotor muscle
Cite this Entry
“Arrector pili muscle.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/arrector%20pili%20muscle. Accessed 7 Jul. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share