Meaning of ANATOMICAL SPHINCTER

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