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sphincter pupillae


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The muscle that expands the iris and thereby constricts the pupil of the eye. Compare dilator pupillae. [From Greek sphinkter a tightener, from sphingein to bind tight + Latin pupillae of the pupil, from pupilla a pupil, diminutive of pupa a girl or a doll, alluding to the tiny reflection in the eye]

Subjects: Psychology.


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