Sphincter: A ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body. Examples are the anal sphincter (around the opening of the anus) and the pyloric sphincter (at the lower opening of the stomach).
Source: National Institute of Health
Sphincter: a ring of muscle that contracts to close an opening.
Source: WordNet 2.1
Source - WordNet 2.1
Source - WordNet 2.1
Source - WordNet 2.1
The following list attempts to classify Sphincter into categories where each line is subset of the next.
Source: WordNet 2.1
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