Webster's English Dictionary

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os

1. os \'a:s\ \'a:s-*\ n or os.sa [L oss-, os - more at OSSEOUS] pl  : BONE 
2. os \'o-s\ \'o-r-*, 'o.r-*\ n or ora [L or-, os - more at ORAL] pl  : 
   MOUTH, ORIFICE 
3. os \'o-s\ \'o--.sa:r\ n or osar [Sw a.s mountain ridge, fr. ON a-ss; 
   akin to Gk o-mos pl X shoulder - more at HUMERUS : ESKER