ANATOMICAL SPHINCTER

WordNet Dictionary

	Definition:	[n] a ring of muscle that contracts to close an opening

	Websites:

	Synonyms:	sphincter, sphincter muscle

	See Also:	anal sphincter, bladder sphincter, muscle, musculus, musculus sphincter ani, musculus sphincter ductus choledochi, musculus sphincter ductus pancreatici, musculus sphincter pupillae, musculus sphincter pylori, musculus sphincter urethrae, musculus sphincter vesicae, physiological sphincter, pupillary sphincter, pyloric sphincter, pyloric valve, sphincter ani, urethral sphincter