Definitions for urethral sphincter
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Princeton's WordNet
urethral sphincter, musculus sphincter urethrae(noun)
a striated sphincter muscle that constricts the urethra
Wiktionary
urethral sphincter(Noun)
The collective name for the muscles used to control the flow of urine from the urinary bladder. These muscles surround the urethra, so that when they contract, the urethra is closed.
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"urethral sphincter." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/urethral sphincter>.

