corrugator
noun
cor·ru·ga·tor
ˈkȯr-ə-ˌgāt-ər 
: a muscle that contracts the skin into wrinkles
especially
: one that draws the eyebrows together and wrinkles the brow in frowning
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“Corrugator.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/corrugator. Accessed 26 Apr. 2024.
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