Meaning of the word sphincter in English

What does sphincter mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

sphincter

US /ˈsfɪŋk.tɚ/
UK /ˈsfɪŋk.tər/
"sphincter" picture

Noun

a ring of muscle surrounding and serving to guard or close an opening or tube in the body, such as the anus or the opening of the stomach into the duodenum.

Example:
The esophageal sphincter prevents stomach acid from flowing back into the esophagus.
Damage to the anal sphincter can lead to incontinence.