- 1. n. A muscle which surrounds, and by its contraction tends to close, a natural opening; as, the sphincter of the bladder. Source: opted
- 2. a. Of, pertaining to, or designating, a sphincter; as, a sphincter muscle. Source: opted
- 3. n. a ring of muscle that contracts to close an opening Source: wordnet
- 4. A muscle which surrounds, and by its contraction tends to close, a natural opening; as, the sphincter of the bladder. Of, pertaining to, or designating, a sphincter; as, a sphincter muscle. Source: webster
- 5. A muscle which surrounds, and by its contraction tends toclose, a natural opening; as, the sphincter of the bladder. Source: adambom
- 6. n:100 n. a ring of muscle that contracts to close an opening Source: ecdict
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