noun
or pyloric sphincter
1. : the circular fold of mucous membrane containing a ring of circularly disposed muscle fibers that closes the vertebrate pylorus
2. : the valvular fold of the pylorus of an invertebrate
noun
or pyloric sphincter
1. : the circular fold of mucous membrane containing a ring of circularly disposed muscle fibers that closes the vertebrate pylorus
2. : the valvular fold of the pylorus of an invertebrate
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012