Webster's English Dictionary

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pylorus

py.lo.rus \-*s\ \pi--'lo-(*)r-.i-; p*-'lo-(*)r-.i-, -(.)e-; -'lo.(*)r-\ n 
   or py.lo.ri [LL, fr. Gk pylo-ros, lit., gatekeeper, fr. pyle-] pl  : the 
   opening in a vertebrate from the stomach into the intestine