DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Bac \Bac\, n. [F. See Back a vat.]
      1. A broad, flat-bottomed ferryboat, usually worked by a
         rope.
         [1913 Webster]
      2. A vat or cistern. See 1st Back.
         [1913 Webster]