The Collaborative International Dictionary of English v.0.48:

Overhead \O`ver*head"\, adv.
   Aloft; above; in or attached to the ceiling or roof; in the
   story or upon the floor above; in the zenith.
   [1913 Webster]

         While overhead the moon
         Sits arbitress.                          --Milton.
   [1913 Webster]

   Note: Also used adjectively; as, an overhead crane, gear,
         etc.
         [1913 Webster]

   Overhead engine, a vertical steam engine in which the
      cylinder stands above the crank.

   Overhead work, a general term in manufactories for
      countershafting and gearing, when overhead.
      [1913 Webster]