Definition, Meaning & Synonyms

sphincter

Noun

/ˈsfɪŋk.tər/

Definition

A ring-like muscle that surrounds and controls the opening of a bodily passage or orifice.

Examples

The lower esophageal sphincter prevents acid from entering the esophagus.
The anal sphincter controls the expulsion of feces from the body.
During the surgery, the doctor had to check the integrity of the sphincter muscle.

Meaning

Sphincters are circular muscles that can tighten or relax to either open or close a passage in the body, helping to regulate various bodily functions.