Source : Webster's Revised Unabridged Dictionary (1913)

Fumed oak \Fumed oak\ (Cabinetwork)
   Oak given a weathered appearance by exposure in an air-tight
   compartment to fumes of ammonia from uncorked cans, being
   first given a coat of filler.

Source : WordNet®

fumed oak
     n : oak given a weathered appearance by exposure to fumes of
         ammonia; used for cabinetwork