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sphincterotomy

sphincterotomy Surg.
  (sfɪŋktəˈrɒtəmɪ)
  [f. sphincter: see -tomy.]
  The surgical cutting of or into a sphincter.

1890 in Billings Med. Dict. 1892 A. Duane tr. Fuchs's Textbk. Ophthalm. iv. iii. 726 Stellwag's operation is called oblique blepharotomy or sphincterotomy. 1922 J. Joyce Let. 4 Oct. (1966) III. 67 He says that..a slight operation—not iridectomy or iridotomy but sphincterotomy will probably restore a great part of former vision. 1977 Proc. R. Soc. Med. LXX. 160/2, I do not think this particular technique is suitable for simple procedures such as cholecystectomy or sphincterotomy.

Oxford English Dictionary

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