Procedure of surgically cutting a sphincter (valve) in the body to stop it working. For example, cutting the sphincter in the male urethra to help the flow of urine from the body in people with certain types of bladder problems.
1. <procedure> Excision of a portion of the pupillary border of the iris. ... 2. Dissecting away any sphincter muscle. ... Origin: sphincter + G. Ektome, excision ... (05 Mar 2000) ... 
(sfingk″tәr-ek´tә-me) excision of a sphincter.
Type: Term Pronunciation: sfingk′tĕr-ek′tŏ-mē Definitions: 1. Excision of a portion of the pupillary border of the iris. 2. Dissecting away any sphincter muscle.
sphincterectomy Dissecting or cutting away any sphincter muscle.