Medical Definition of pyloric sphincter
: the circular fold of mucous membrane containing a ring of circularly disposed muscle fibers that closes the vertebrate pylorus
— called also pyloric valve
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“Pyloric sphincter.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/pyloric%20sphincter. Accessed 2 Oct. 2022.
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