Sphinc"ter (?), n. [NL., fr. to bind tight.] Anat.
A muscle which surrounds, and by its contraction tends to close, a natural opening; as, the sphincter of the bladder.
© Webster 1913.
Sphinc"ter, a. Anat.
Of, pertaining to, or designating, a sphincter; as, a sphincter muscle.
© Webster 1913.