sphincter pupillae

noun

sphincter pu·​pil·​lae -pyü-ˈpil-ē How to pronounce sphincter pupillae (audio)
: a broad flat band of smooth muscle in the iris that surrounds the pupil of the eye

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“Sphincter pupillae.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/sphincter%20pupillae. Accessed 27 Feb. 2025.

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