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90s Slang You Should Know

sphincter muscle of pupil

sphincter muscle of pupil in Medicine

sphincter muscle of pupil n.
A ring of smooth muscle fibers surrounding the pupillary border of the iris.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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