from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a striated sphincter muscle that constricts the urethra
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