The Collaborative International Dictionary of English v.0.48:

Aboon \A*boon"\, prep.
   and adv. Above. [Scot. & Prov. Eng.]
   [1913 Webster]

         Aboon the pass of Bally-Brough.          --Sir W.
                                                  Scott.
   [1913 Webster]

         The ceiling fair that rose aboon.        --J. R. Drake.
   [1913 Webster]