Webster's English Dictionary

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orifice

Cross references:
  1. aperture              
 
or.i.fice \'o.r-*-f*s, 'a:r-\ \.o.r-*-'fish-*l, .a:r-\ n [MF, fr. LL 
   orificium, fr. L or-, os mouth - more at ORA]L : a mouth or similar opening 
   : HOLE  - or.i.fi.cial aj