plural orbiculares oris
: a muscle made up of several layers of fibers passing in different directions that encircles the mouth and controls most movements of the lips (as compressing, closing, or pursing movements)
Cite this Entry
“Orbicularis oris.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/orbicularis%20oris. Accessed 28 Feb. 2025.
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