The Collaborative International Dictionary of English v.0.48:

Ora \O"ra\, n. [AS. See 2d Ore.]
   A money of account among the Anglo-Saxons, valued, in the
   Domesday Book, at twenty pence sterling.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Os \Os\, n.; pl. Ora. [L.]
   A mouth; an opening; an entrance.
   [1913 Webster]