a circular band of voluntary or involuntary muscle that encircles an orifice of the body or one of its hollow organs.
- sphinc·ter·al, sphinc·te·ri·al [sfingk-teer-ee-uhl], /sfɪŋkˈtɪər i əl/, sphinc·ter·ic [sfingk-ter-ik], /sfɪŋkˈtɛr ɪk/, sphinc·ter·ate [sfingk-ter-it, -tuh-reyt], /ˈsfɪŋk tər ɪt, -təˌreɪt/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use sphincter in a sentence
As for the cable anchors, their faces are the upper body equivalent of a failed sphincter nerve.
Introduce the bulb of an ordinary clinical thermometer, well greased with vaseline, just within the sphincter ani.The Elements of Bacteriological Technique | John William Henry Eyre
This sphincter opens automatically only in connection with the act of swallowing.Physiology | Ernest G. Martin
Four or more sutures may be passed in this way, a final one bringing the cut ends of the sphincter ani together.
Cases in which the perineum is apparently intact, but in which the sphincter is not united (Figs. 35, 36).
If, however, the sphincter is intact and serviceable the fistula should be pared and the edges brought together by silk sutures.
British Dictionary definitions for sphincter
anatomy a ring of muscle surrounding the opening of a hollow organ or body and contracting to close it
- sphincteral, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for sphincter
A ring-shaped muscle that encircles an opening or passage in the body. The opening and closing of the anus is controlled by contraction and relaxation of a sphincter, as is the opening that leads to the stomach from the esophagus.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.