corrugator

/ (ˈkɒrʊˌɡeɪtə) /

noun

a muscle whose contraction causes wrinkling of the brow

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Medical definitions for corrugator

corrugator
[ kôrə-gā′tər ]

n.

A muscle that draws the skin together, causing it to wrinkle.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.