noun
a ring of muscle that contracts to close an opening
• Syn: ↑sphincter, ↑sphincter muscle
• Hyponyms:
↑physiological sphincter, ↑anal sphincter, ↑sphincter ani, ↑musculus sphincter ani, ↑urethral sphincter, ↑musculus sphincter urethrae, ↑bladder sphincter, ↑musculus sphincter vesicae, ↑musculus sphincter ductus choledochi, ↑musculus sphincter ductus pancreatici, ↑pupillary sphincter, ↑musculus sphincter pupillae, ↑pyloric sphincter, ↑pyloric valve, ↑musculus sphincter pylori
Useful english dictionary. 2012.