The Collaborative International Dictionary of English v.0.48:

Tudor \Tu"dor\, a.
   Of or pertaining to a royal line of England, descended from
   Owen Tudor of Wales, who married the widowed queen of Henry
   V. The first reigning Tudor was Henry VII.; the last,
   Elizabeth.
   [1913 Webster]

   Tudor style (Arch.), the latest development of Gothic
      architecture in England, under the Tudors, characterized
      by flat four-centered arches, shallow moldings, and a
      profusion of paneling on the walls.
      [1913 Webster]