Sphincter — Defs

01 n. A muscle which surrounds, and by its contraction tends to close, a natural opening; as, the sphincter of the bladder.

1.
A muscle which surrounds, and by its contraction tends to close, a natural opening; as, the sphincter of the bladder.(Anat.)

02 a. Of, pertaining to, or designating, a sphincter; as, a sphincter muscle.

1.
Of, pertaining to, or designating, a sphincter; as, a sphincter muscle.(Anat.)