sphincterectomy

[sfĭngk′tə-rĕktə-mē]

n.

Excision of a portion of the pupillary border of the iris.
Excision of a sphincter muscle.

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