sphincter
sphinc-ter
noun
A ring of muscle surrounding and guarding a natural body opening or passage.
"The anal sphincter controls bowel movements."
Thesaurus
Synonyms: sphincter muscle, anatomical sphincter
sphinc-ter
A ring of muscle surrounding and guarding a natural body opening or passage.
"The anal sphincter controls bowel movements."
Synonyms: sphincter muscle, anatomical sphincter