1. (noun) a ring of muscle that contracts to close an opening

• sphincter
• sphincter muscle

1. (noun) a ring of muscle that contracts to close an opening

• anal sphincter
• musculus sphincter ani
• sphincter ani
• bladder sphincter
• musculus sphincter vesicae
• musculus sphincter ductus choledochi
• musculus sphincter ductus pancreatici
• musculus sphincter pupillae
• pupillary sphincter
• musculus sphincter pylori
• pyloric sphincter
• pyloric valve
• musculus sphincter urethrae
• urethral sphincter
• physiological sphincter

1. (noun) a ring of muscle that contracts to close an opening

• muscle
• musculus