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Webster 1913 Edition

Noun.

[NL., fr. [GREEK][GREEK][GREEK] to bind tight.]

(Anat.)

A muscle which surrounds, and by its contraction tends to close, a natural opening;

as, the

sphincter

of the bladder

Adj.

(Anat.)

Of, pertaining to, or designating, a sphincter;

as, a

sphincter

muscle

Noun.

In anatomy, a muscle that contracts or shuts; as the sphincter labiorum; sphincter vesica.